Prolongation of murine skin allografts across a major histocompatibility locus using supernatants from con-A activated spleen cells.

Supernatants from Concanavalin A-activated mouse spleen cell cultures have been found to prolong skin graft survival across the H-2 locus in the mouse. There exist in these supernatants non-specific factors synthesized by suppressor T cells which have been activated by sub-optimal concentrations of Concanavalin A in vitro. The possible nature of these factors is discussed.