Abstract

Balb/c mice were immunized with dextran B1355S and assayed for serum antibodies and direct plaque-forming cells. The earliest detectable anti-dextran response occurred in 2-week-old animals. Anti-idiotypic antisera against MOPC-104E and J558 were raised in A/He mice and rendered individual idiotype specific by cross-absorption. When the amounts of MOPC-104E and J558 idiotypes in immune sera and the PFC response of individual mice were analyzed, the ratio of both idiotypes were found highly variable in all tested animals. This observed individual variability in the expression of two major idiotypes in the Balb/c response to dextran B1355S provides an experimental basis for investigating the mechanisms regulating idiotype expression.

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