TY - JOUR AU - Mathis, D TI - Positive selection of the T cell repertoire: where and when does it occur? JF - Cell DO - 10.1016/0092-8674(89)90501-1 DA - 1989-10-24 UR - https://www.deepdyve.com/lp/pubmed/positive-selection-of-the-t-cell-repertoire-where-and-when-does-it-MR3dXENQQi SP - 1027 EP - 33 VL - 58 IS - 6 DP - DeepDyve ER -