title: Phylogenesis of mast cells. II. Ultrastructure of mast cells in the frog.
mesh_terms: D000818:Animals; D001001:Anura; D005075:Biological Evolution; D008407:Mast Cells / Q000166:cytology*; D008643:Mesentery / Q000166:cytology*; D008854:Microscopy, Electron; D013154:Spleen / Q000166:cytology*; D013950:Thymus Gland / Q000166:cytology*