Monoclonal antibodies to rat brain choline acetyltransferase were produced by the hybridoma technique. Two stable cell lines, Ab-57 and Ab-60, secreted immunoglobulin of subclass IgG1. The monoclonal antibodies bound to choline acetyltransferase without blocking catalytic activity. Affinity of Ab-57 was 100-times higher than that of Ab-60. Both antibodies bound to the rat enzyme in a mutually exclusive fashion. The antibodies showed cross-species reactivity with choline acetyltransferase from several mammalian brains.
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Ichikawa et al. (1983) studied this question.
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