Abstract
Most peritoneal fluid mast cells of the rat are spherical; non-spherical cells, which occur with increasing frequency as animals get older, slowly become spherical when removed from a donor individual. Mast cells deformed experimentally in the pressure-centrifuge also become spherical in vitro. By time-lapse photographic methods coupled with cytometric procedures, it was shown that sphering is a well-organized, continuous process. The data suggest that real differences exist between mast cells of young and older rats, but that these are inherent in the individual cells, and not the animal as a whole. Mast cells of young rats behave as if invested with an elastic envelope. This is in contrast to mast cells from older rats which do not exhibit this behavior.
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