Related by context. Frequent words. (Click for all words.) 41 amenorrhea 37 periods 35 colleagues 35 neurobiologists 34 Johannes Gutenberg University 34 Sweden Karolinska Institute 33 shorter durations 33 researchers 33 Niels Bohr Institute 33 Tubingen 33 durations 32 Lead researcher 32 RLS symptoms 32 Hakonarson 32 MD M.Sc. 31 Karolinska Institute 30 HHMI investigator 30 Cancer Epidemiology 30 genetically altered mice 30 MD PhD 30 Ph.D. postdoctoral fellow 30 EMBL 30 JAMA editorial 29 MD MSc 29 PNAS paper 29 PhD associate professor 29 coauthors 29 MD Ph.D. 29 post doctoral fellows 29 hypnotics 28 pharmacologists 28 Science journal PLoS 28 molecular pharmacology 28 epochs 28 neuroscientists 28 menses 27 Rudolf Jaenisch 27 neurobiologist 27 biostatistician 27 El Ninos 27 Drs 27 perimenopause 26 primatologists 26 Postdoctoral 26 authors 26 Molecular Pathology 26 postdoctoral fellow 26 Experimental Medicine 26 Uppsala University 26 computational methods 26 oral corticosteroids 25 Professor 25 neuropsychiatry 25 postdoctoral research 25 biophysicist 25 gerontologists 25 prolonged 25 developmental biologist 25 postdoctoral fellows 25 postdoctoral researcher 25 postdoctoral researchers 25 rhesus monkeys 25 postdoctoral scholar 25 interglacial 25 patterns 25 postdoctoral associate 25 biochemists 24 PhD 24 evolutionary biologists 24 duration 24 HSPH 24 wakeful 24 postdocs 24 muscle cramping 24 postdoctoral 24 theoretical physicists 24 interglacial period 24 doctoral researcher 24 Biochemist 23 doctoral thesis 23 contemporaries 23 collegial 23 Prof. 23 biochemist 23 Medscape Medical 23 postdoc 23 genetically engineered mice 23 collegues 23 doctoral 22 listlessness 22 inactivity 22 physicists 22 findings 22 researcher 22 items affecting comparability 22 mates 22 Assistant Professor 22 Ph.D. 22 Prof 22 et al 22 intervals