title: Heterogeneity of polypeptide hormones during aging.
mesh_terms: D000375:Aging; D000818:Animals; D006728:Hormones / Q000502:physiology*; D007328:Insulin / Q000502:physiology; D008297:Male; D010455:Peptides / Q000502:physiology*; D011498:Protein Precursors / Q000502:physiology; D051381:Rats; D013972:Thyrotropin / Q000502:physiology
chemical_list: D006728:Hormones; D007328:Insulin; D010455:Peptides; D011498:Protein Precursors; D013972:Thyrotropin