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Distribution of theta antigens in ovum fusion derived AKR--CBA-H-T6T6 tetraparental mouse chimaeras.

The distribution of antigens has been studied on blood lymphocytes of eight AKR °CBA/H-T6T6 chimaeras using immunoautoradiography and of male hybrids born from the mixed germ line AKR °CBA/H-T6T6 chimaera × Balb/c involving the cytotoxicity method. Analysis of positive cells in the peripheral blood of the tetraparental chimaeras showed that the sum of both positive cell populations varied between 49 and 81 % of the total blood lymphocytes. In spite of this, there was a marked variation in the proportion of the two cell populations - in some chimaeras ARK positive cells predominated, in others the reverse was true. In hybrids it is apparent that both antigens were detected, and furthermore, the total percentage exceeded 100 %. The quantative distribution of both θ antigens is held to reflect the contribution of each genotype in the general make-up of the total somatic population and it is concluded that the ovum fusion has not resulted in cell hybridization.