B cells in patients with X-linked and 'common variable' hypogammaglobulinaemia.

E- cells from three patients with X-linked and three patients with non-familial 'common variable' hypogammaglobulinaemia were stained by indirect immunofluorescence with a panel of B cell specific monoclonal antibodies (anti-Bp95, Bp35 and Bp135). The number of B cells detected with the pan-B cell antibodies was variable between patients. One patient in each group was found to have near normal numbers of circulating B cells although those of the X-linked patient were clearly immature.