[B-lymphocytes subpopulation. Rapid identification with a histoimmunological method (author's transl)].

After extraction of tissues (spleen, thymus, blood) B cell bearing surface immunoglobulins were specifically labelled with Fab-peroxidase conjugate in light and electron microscopy. Positive and negative labelled lymphocyte were counted. This procedure allowed us to quantitate B and T cell in different diseases in peripheral blood and within lesions. It may represent a new immunopathological approach.