Abstract

1. The gestational age of donor hematopoietic tissue appeared to have no influence on the 30-day mortality following homologous transplants in irradiated mice.

2. Recipients of second trimester homologous donor tissue had a late (90-day) mortality that was 16 per cent lower than that observed in animals receiving tissue from third trimester and neonatal donors, but statistical analysis showed a low level of significance.

3. Irradiation alone appeared to cause a late mortality in non-injected irradiated animals and in isologously transplanted irradiated animals.

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