title: Positive selection in the thymus: an enigma wrapped in a mystery.
authors.affiliation: Department of Cellular and Molecular Medicine and Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093, USA. shedrick@ucsd.edu
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Hedrick
mesh_terms: D000818:Animals; D010446:Peptide Fragments / Q000502:physiology*; D011948:Receptors, Antigen, T-Cell / Q000037:antagonists & inhibitors* / Q000502:physiology*; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D013950:Thymus Gland / Q000166:cytology*
chemical_list: D010446:Peptide Fragments; D011948:Receptors, Antigen, T-Cell