CD5 and autism: There were also increases in mature B cellnumbers as denoted by the absence of CD5 staining (CD5n) on B cells in autismsubjects compared with typically developing controls (Table 6, p = 0.0001).Notably, although the number of B cells was increased in autism, the number ofimmature B cells, as denoted by positive CD5 staining, was not different betweenautism and controls (278.3±142.1 vs. 329.4±171.8,p = 0.14).