Abstract
ABSTRACTThe sites of cell proliferation and the duration of the S‐phases in epithelia (tongue, stomach, duodenum, jejunum, ileum and descending colon) of the pouchless opossum, Marmosamitis, have been studied following the injection of tritiated thymidine. the sites of cell proliferation in these epithelia are not significantly different than those reported for rodent tissues. On the other hand, measurements of the mean duration of DNA synthesis revealed great variability in this phase: tongue (12.8 hr), stomach (>14.0 hr), duodenum (8.5 hr), jejunum (8.6 hr), ileum (9.7 hr) and descending colon (11‐3 hr). In addition, the values obtained for the mean duration of t2 (G2+2/1M) are fairly constant among the various epithelia. It is concluded that the times obtained for the average duration of the S‐phases are longer and more variable in M. mitis than similar observations reported on renewing epithelia of eutherian mammals.
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