Heterogeneity of the tolerant state in rats with long established skin grafts.

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Abstract
Tolerance in rats with long established allogeneic skin grafts brought about by the neonatal inoculation of hybrid lymphomyeloid cells is immunologically heterogeneous because 2 states of tolerance may be defined operationally as fully and partially tolerant. T cells from fully tolerant donors transfer tolerance and are unresponsive in MLC, but T cells from partially tolerant donors do not transfer tolerance and are modestly responsive in MLC. A state of tolerance may exist without detectable suppression. Therefore, tolerance, traditionally defined as the permanent acceptance of an allogeneic skin graft, does not reflect a uniform immunologic state.

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