title: Morphological studies of the embryonic rabbit thymus: the in situ epithelial versus the extrathymic derivation of the initial population of lymphocytes in the embryonic thymus.
mesh_terms: D000818:Animals; D001485:Basement Membrane; D002454:Cell Differentiation; D004721:Endoplasmic Reticulum; D006056:Golgi Apparatus; D008214:Lymphocytes / Q000166:cytology*; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D008928:Mitochondria; D011817:Rabbits; D013950:Thymus Gland / Q000166:cytology* / Q000196:embryology*