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(A) Lysates prepared from HeLa cells were subjected to gel filtration chromatography. Collected fractions were analyzed by immunoblot with the indicated antibodies. (B) B14 and B12 interact. HeLa cell lysates were used for immunoprecipitation with control IgG or antibodies against endogenous B12 or B14. (C) As in (B) except CV-1 cell lysate was used.
