[Spontaneous blast formation of spontaneous rosette-forming human lymphocytes with sheep and mouse erythrocytes: morphological demonstration].

A high uptake rate of 3HTdR by human cultured rosette-forming lymphocytes with sheep or mouse erythrocytes without stimulation has been already found occasionally in a discrete percentage of experiments by the Authors. In this paper morphologic evidence is shown that in those cultures "blastic" or "blast-like" cells are present, probable expression of spontaneous lymphocyte activation by "rosetting" phenomenon.