STAT5 expression in HIV-infected patients. Immunoblotting of WCEs (10 μg) of PBMCs isolated from 4 HIV-infected and 2 healthy, HIV⁻ individuals using a mixture of anti-STAT5a and anti-STAT5b rabbit polyclonal Abs in the upper panel and, after stripping of the filter, using an anti-STAT5 mouse MoAb that recognizes an internal epitope of STAT5 (lower panel).