The effect of age and strain on the amount of neurosecretion.
D000375:Aging; D000818:Animals; D006168:Guinea Pigs; D007031:Hypothalamus / Q000502:physiology; D009489:Neurosecretion; D010902:Pituitary Gland / Q000502:physiology; D013194:Staining and Labeling; D013312:Stress, Physiological