title: Some cases of animal longevity following treatment with early fetal thymic extracts.
mesh_terms: D000818:Animals; D005260:Female; D006168:Guinea Pigs; D008136:Longevity; D008297:Male; D051379:Mice; D051381:Rats; D011919:Rats, Inbred Strains; D013950:Thymus Gland / Q000196:embryology* / Q000502:physiology