Abstract
Immunocytochemical staining methods were applied toward denning the in situ expansion of the BALB/c mouse antibody-forming cells (AFC) that express the CRIc idiotype (id) family associated with the antibody response against the p-azophenylarsonate (Ar) hapten. CRIc + AFC dominated the early primary anti-Ar response but represented a decreased fraction of the anti-Ar AFC during secondary responses. Two subsets of the CRIc family, CRIc1 and CRIc2, differed in their relative expression, with CRIc1 more pronounced during primary responses and CRIc2 better expanded in secondary responses. Idiotopic differences among AFC in very close proximity suggested convergent migration among B cells having similar but not identical V regions or possibly V region mutations among clonally derived cells. The approach also allowed in situ idiotypic analysis of polyclonally activated B AFC.
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