Figure 1. Changes in body weight of wild-type and Rag-2^−/− mice during 26 weeks. The body weight of wild-type (WT) and Rag-2^−/− was measured once a week from 4 to 26 weeks of age. During the whole observation period, body weight was similar between WT male (open squares) and Rag-2^−/− (filled squares), and between WT female (open circles) and Rag-2^−/− female (filled circles) mice.