title: The use of a protozoan for studies on aging. II. The macronucleus in young and old organisms of Tokophrya infusionum: light and electron microscope observations.
mesh_terms: D000375:Aging / Q000502:physiology*; D000818:Animals; D004583:Electrons; D056890:Eukaryota; D007448:Invertebrates; D008027:Light; D048648:Macronucleus
keywords: AGING/physiology; PROTOZOA