title: Photoperiod and crowding effects on testicular serotonin metabolism and lack of effects on melatonin synthesis in Uinta ground squirrels (Spermophilus armatus).
mesh_terms: D000818:Animals; D001835:Body Weight; D002247:Carbon Isotopes; D002940:Circadian Rhythm; D003441:Crowding; D003624:Darkness; D004781:Environmental Exposure; D008027:Light; D008297:Male; D008550:Melatonin / Q000096:biosynthesis*; D008995:Monoamine Oxidase / Q000032:analysis / Q000378:metabolism; D009924:Organ Culture Techniques; D009929:Organ Size; D010870:Pineal Gland / Q000378:metabolism; D012589:Sciuridae / Q000378:metabolism*; D012701:Serotonin / Q000378:metabolism*; D013737:Testis / Q000033:anatomy & histology / Q000201:enzymology*
chemical_list: D002247:Carbon Isotopes; D012701:Serotonin; D008995:Monoamine Oxidase; D008550:Melatonin