In vitro concanavalin A (Con A)-activated spleen cells suppressed the primary in vitro immune response of syngeneic spleen cells to sheep erythrocytes (SRBC) but enhanced the in vivo anti-SRBC responses when transferred to syngeneic untreated mice. Con-A-activated spleen cells injected into nude mice enabled these mice to respond to SRBC.
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Göran Möller (1985) studied this question.