[Mast cell origin studied by H3-thymidine radioautography]

Reproduction of mast cells has been investigated by means of H3-thymidine radioautography in 26 mature mice of CC-57 White line and in 40 new-born nonlinear albino rats under normal conditions and experimental cold effect. It is established that differentiated mast cells incorporate H3-thymidine and can enter the phase of DNA synthesis of a proliferative cycle.