It was described earlier that in the tissue cultures of immune mouse LN cells the number of antibody producing cells was increased 2-3-fold when syngeneic of allogeneic nonimmune BM cells were included in the cultures. In these experiments, parallel mixed cultures were set up of mouse immune LN cells with non-immune BM cells of either syngeneic or xenogeneic origin (rat, pig and chicken). Xenogeneic BM also increased the number of PFC in the mixed cultures. The intensity of the stimulation effected by xenogeneic BM of all three species tested was comparable to that induced by syngeneic BM. The number of PFC in all types of the mixed cultures was significantly higher (P less than 0.005) than in the LN cell cultures alone. The differences between the effect of syngeneic and xenogeneic BM and between the xenogeneic BM cells of different origin were not statistically significant (P less than 0.05).

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