Polyclonal and monoclonal antibodies raised against acetylcholine receptors from Torpedo californica and Electrophorus electricus electroplaque were tested for interaction with the [125I]alpha-bungarotoxin binding protein of goldfish brain. A subset of monoclonal antibodies which recognize the main immunogenic region of the alpha subunit of the Electrophorus acetylcholine receptor interacted at high affinity with the [125I]alpha-bungarotoxin binding protein. Using immunofluorescence, these antibodies were shown to label the same layers of the optic tectum as [125I]alpha-bungarotoxin.
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