Organismal differentiation, ageing and rejuvenation.
D000375:Aging; D000818:Animals; D002454:Cell Differentiation; D002455:Cell Division; D002470:Cell Survival; D008938:Mitosis; D014176:Protein Biosynthesis; D051381:Rats; D012038:Regeneration; D014419:Turbellaria / Q000166:cytology