Development of amphibian thymus. II. Sequential occurence of two epithelial cell types in the urodele Pleurodeles waltlii.
D000818:Animals; D002454:Cell Differentiation; D004847:Epithelial Cells; D008214:Lymphocytes / Q000166:cytology; D012159:Reticulum / Q000648:ultrastructure; D013950:Thymus Gland / Q000166:cytology / Q000196:embryology*; D013997:Time Factors; D014562:Caudata / Q000196:embryology*