Hydroxyprogesterones Male 12 nonhuman 12 Rats 10 animal cell 10 animal experiment 10 article 10 rat 10 11beta hydroxypregna 1,4 diene 3,20 dione 8 Animals 8 Rats, Inbred Strains 8 Thymus Gland 8 corticosterone 8 radioisotope 8 unclassified drug 8 Animal 6 Progesterone 6 Support, Non-U.S. Gov't 6 Uridine 6 intraperitoneal drug administration 6 male 6 progesterone derivative 6 thymocyte 6 11beta hydroxyprogesterone 4 Chorionic Gonadotropin 4 Female 4 Mice 4 Mice, Inbred BALB C 4 RNA 4 Testosterone 4