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a-Bungarotoxin (aBgtx) is a toxin known to interact with muscle nicotinic receptors and with some neuronal nicotinic receptors. We show that aBgtx binding sites are also expressed in nonmuscle and nonneuronal human cells, including small cell lung carcinoma and several epithelial cell lines. These receptors are immunologically related to the aBgtx receptors of unknown function described in the nervous system and in the IMR32 neuroblastoma cell line and are distinct from muscle nicotinic receptors. We have also cloned from IMR32doi:10.1073/pnas.89.5.1572 pmid:1542648 pmcid:PMC48494 fatcat:sselaaze7ncrdpx3ryd26eefeq