Effect of radiation upon the "embryonic" thymus.
D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn / Q000528:radiation effects; D004847:Epithelial Cells; D004848:Epithelium / Q000528:radiation effects; D008214:Lymphocytes / Q000528:radiation effects; D008938:Mitosis / Q000528:radiation effects; D009893:Opossums; D011830:Radiation Effects; D012038:Regeneration; D013950:Thymus Gland / Q000254:growth & development / Q000473:pathology / Q000528:radiation effects*