“…Vitetta et al (107,110) and Uhr et al (103) probed the chain structure of the TL antigen by the SDS-PAGE method after surface iodination of the lymphocytes with 1251. In the initial experiments (107) antisera against H-2a, H-2b, and TL-1,2,3 were used to obtain immunoprecipitates of surface-labeled mouse thymocytes extracted with Nonidet-P40.…”