Abstract
Immediately after partial-body irradiation, the number of colony-forming units (CFU) of the protected marrow decreases. This decrease seems to be dose-dependent and cannot be completely explained by migration for the following reasons: there is no evidence of CFU entry to irradiated territories and the number of circulating CFU does not increase. A more plausible explanation for the phenomena is an accelerated differentiation during the first 15 min after irradiation. The migration of CFU to the spleen is observed between 15 min and 3 hours after irradiation, after which it ceases. The absence of migration 3 hours after irradiation may be due to one of the two possibilities: (1) a depletion of the mobile pool of CFU if one admits that such a pool is responsible for migration in the organism; (2) a depletion of a temporarily increased stimulus due to irradiation.
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