Isogeneic lymphocyte interaction: recognition of self antigens by cells of the neonatal thymus.

Cells with the ability to recognize self antigens have been demonstrated in the thymus of the neonatal mouse. The detection of these cells is based upon a newly described in vitro phenomenon termed the isogeneic lymphocyte interaction. This interaction is demonstrable by [(14)C]thymidine uptake in cultures containing mixtures of neonatal thymus cells and adult spleen cells from the CBA strain of mice.

Hemagglutination and hemolysis by : lichen extracts.

Twenty-two species of lichens from 10 different genera possessed a hemagglutinin for one or more of human, sheep, horse, cow, rabbit, guinea pig, and chicken erythrocytes. Hemolysins were also detected occasionally, but these were only active at low dilutions. In those species tested, the hemolytic principle was dialyzable; the hemagglutinating agent was not.