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Robert Maidstone Oxford Centre for Diabetes, Endocrinology and Metabolism, and Oxford Kavli Centre for Nanoscience Discovery, University of Oxford, Oxford, UK
Centre for Biological Timing, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK

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Martin K Rutter Centre for Biological Timing, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
Diabetes, Endocrinology and Metabolism Centre, Manchester University NHS Foundation Trust, NIHR Manchester Biomedical Research Centre, Manchester Academic Health Science Centre, Manchester, UK

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Thomas Marjot Oxford Centre for Diabetes, Endocrinology and Metabolism, and Oxford Kavli Centre for Nanoscience Discovery, University of Oxford, Oxford, UK
Oxford Liver Unit, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, UK

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David W Ray Oxford Centre for Diabetes, Endocrinology and Metabolism, and Oxford Kavli Centre for Nanoscience Discovery, University of Oxford, Oxford, UK
NIHR Oxford Health Biomedical Research Centre, and NIHR Oxford Biomedical Research Centre, John Radcliffe Hospital, Oxford, UK

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Matthew Baxter Oxford Centre for Diabetes, Endocrinology and Metabolism, and Oxford Kavli Centre for Nanoscience Discovery, University of Oxford, Oxford, UK
NIHR Oxford Health Biomedical Research Centre, and NIHR Oxford Biomedical Research Centre, John Radcliffe Hospital, Oxford, UK

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shifts. This challenges the alignment between internal circadian time, and the external light–darkness environment, and potentially mediates some of the disease associations seen with shift work. Pathological accumulation of fat in the liver drives non

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Julie Smith Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark

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Jan Fahrenkrug Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark

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Henrik L Jørgensen Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark

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Christina Christoffersen Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark
Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark

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Jens P Goetze Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark
Department of Clinical Biochemistry (KB3014), Department of Technology, Department of Clinical Biochemistry, Department of Biomedical Sciences, Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark

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 h light:12 h darkness cycle for at least 14 days, after which the light was turned off. On the second cycle after transfer into continuous darkness, animals were sacrificed at the same time points as above (circadian time 4 (CT4)–CT24). Blood and

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Cheryl M Isherwood Section of Chronobiology, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom

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M Denise Robertson Section of Metabolic Medicine, Food and Macronutrients, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom

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Debra J Skene Section of Chronobiology, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom

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Jonathan D Johnston Section of Chronobiology, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom

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Introduction Many aspects of endocrinology and metabolism exhibit 24-h rhythms that are driven by an endogenous circadian timing system ( 1 , 2 , 3 ). This circadian system is comprised of a central light-entrained clock in the

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Shuhui Ma Laboratory of Anatomy of Domestic Animals, College of Animal Medicine, China Agricultural University, Haidian, Beijing, China

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Zixu Wang Laboratory of Anatomy of Domestic Animals, College of Animal Medicine, China Agricultural University, Haidian, Beijing, China

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Jing Cao Laboratory of Anatomy of Domestic Animals, College of Animal Medicine, China Agricultural University, Haidian, Beijing, China

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Yulan Dong Laboratory of Anatomy of Domestic Animals, College of Animal Medicine, China Agricultural University, Haidian, Beijing, China

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Yaoxing Chen Laboratory of Anatomy of Domestic Animals, College of Animal Medicine, China Agricultural University, Haidian, Beijing, China

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Introduction Avian circadian system is a complex of mutually coupled pacemakers residing in the pineal gland, the retina and the hypothalamic suprachiasmatic nucleus (SCN), which is synchronized to environmental light cycles ( 1 ). As one of

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Hershel Raff Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine
Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine
Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine
Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine

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Hariprasad Trivedi Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine

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's syndrome) (1, 2, 3, 4, 5, 6, 7) . It is now accepted that an increased late-night salivary cortisol (at the circadian nadir) has 90–95% sensitivity and specificity for the diagnosis of Cushing's syndrome (6, 7) . In patients with normal renal function

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Henryk F Urbanski Division of Neuroscience, Oregon National Primate Research Center, Beaverton, Oregon, USA
Division of Reproductive & Developmental Sciences, Oregon National Primate Research Center, Beaverton, Oregon, USA
Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, Oregon, USA
Department of Physiology & Pharmacology, Oregon Health & Science University, Portland, Oregon, USA

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Kevin Mueller Division of Reproductive & Developmental Sciences, Oregon National Primate Research Center, Beaverton, Oregon, USA

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Cynthia L Bethea Division of Neuroscience, Oregon National Primate Research Center, Beaverton, Oregon, USA
Division of Reproductive & Developmental Sciences, Oregon National Primate Research Center, Beaverton, Oregon, USA
Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, Oregon, USA

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unclear if age-associated perturbations of activity-rest cycles and alterations in circadian hormone patterns are exacerbated after menopause by maintenance on a typical high-fat, high-sugar WSD and, more importantly, if these changes can be overcome by E

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Takuhiro Sonoyama Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Masakatsu Sone Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Naohisa Tamura Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Kyoko Honda Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Daisuke Taura Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Katsutoshi Kojima Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Yorihide Fukuda Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Naotetsu Kanamoto Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Masako Miura Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Akihiro Yasoda Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Hiroshi Arai Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Hiroshi Itoh Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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Kazuwa Nakao Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan

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.1210/jc.2011-0573 ). 13 Wolfe LK Gordon RD Island DP Liddle GW . An analysis of factors determining the circadian pattern of aldosterone excretion . Journal of Clinical Endocrinology and Metabolism 1966 26 1261 – 1266 . ( doi:10.1210/jcem

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Rajae Talbi Department of Medicine, Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA

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Victor M Navarro Department of Medicine, Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA

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female mice results in significant weight gain derived, in part, from feeding impairments ( 57 ). While the overall food consumed was similar to controls, the circadian feeding behavior was severely impaired, losing the nocturnal pattern of feeding

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Jessica S Jarmasz Department of Physiology & Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada

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Yan Jin Department of Physiology & Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada

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Hana Vakili Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas, USA

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Peter A Cattini Department of Physiology & Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada

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has been heavily studied ( 2 ). Serum levels of hGH vary considerably over the course of the day and during the night as it is dependent on a variety of factors including (and not limited to) the circadian rhythm, sleep–wake cycle, diet, metabolism

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Sirazum Choudhury Endocrinology and Investigative Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Commonwealth Building, London, UK
Department of Endocrinology, Imperial College Healthcare NHS Trust, London, UK

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Tricia Tan Endocrinology and Investigative Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Commonwealth Building, London, UK
Department of Endocrinology, Imperial College Healthcare NHS Trust, London, UK

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Katharine Lazarus Endocrinology and Investigative Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Commonwealth Building, London, UK
Department of Endocrinology, Imperial College Healthcare NHS Trust, London, UK

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Karim Meeran Endocrinology and Investigative Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Commonwealth Building, London, UK
Department of Endocrinology, Imperial College Healthcare NHS Trust, London, UK

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circadian cycle and their behavioural cycle (or meal times) was achieved ( 21 ). Three individuals demonstrated impaired glucose tolerance in relation to meals, despite being normoglycaemic prior to the study suggesting acute insulin resistance. Mean

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