Abstract
Rabbits suppressed for paternal immunoglobulin allotypes specified by the b locus were injected with spleen cells from non-inbred donors at the age of 1 month. This resulted in transient chimerism as shown by the appearance of 10 to >200 μg of donor type Ig per milliliter recipient's serum 1 to 2 weeks after cell transfer. Antibody production by donor cells could not be demonstrated during their survival in the recipients. If, and only if, the donor cells produced Ig of the suppressed allotype, the release from suppression was expedited as judged by the time of appearance and increase of lymphoid cells with membrane-bound Ig of the suppressed type, and also by the onset and rise of secreted Ig of this type in the recipients' sera.
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