[Age-related morphological changes in the rat suprachiasmatic nucleus. Correlation with age-related changes in circadian rhythmicity of gross activity].
D000375:Aging / Q000502:physiology*; D000818:Animals; D002940:Circadian Rhythm; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D013493:Suprachiasmatic Nucleus / Q000648:ultrastructure*