摘要：Cell division cycles of equine lymphocytes were studied in in vitro cultures of blood samples from seven horses. The first peak of the mitotic index was observed at 36-42 hr after incubation, and the population of mitotic cells at the time consisted of many at the first (97-62%) and the others at the second (3-38%) division. The frequency of cells at the second division increased gradually and reached a peak at 48 hr (62%) after incubation. The third division started at 48 hr after incubation and frequency reached 55% at 60 hr and 80% or more at 72 hr.
