title: An analysis of mitotic activity and the question of a thymus-like system in planarians.
mesh_terms: D000818:Animals; D046508:Culture Techniques; D006652:Histological Techniques; D008938:Mitosis; D012038:Regeneration; D013950:Thymus Gland / Q000166:cytology*; D013997:Time Factors; D014419:Turbellaria