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The interaction of the acetylcholine receptor (AChR) binding site domain with specific antibodies and with alpha-bungarotoxin (alpha-BTX) has been compared. The cloned and expressed ligand binding domain of the mouse AChR alpha-subunit binds alpha-BTX, whereas the mongoose-expressed domain is not recognized by alpha-BTX. On the other hand, both the mouse and mongoose domains bind to the site-specific monoclonal antibody 5.5. These results demonstrate that the structural requirements for binding of alpha-BTX and mcAb 5.5, both of which interact with the AChR binding site, are distinct from each other.
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Kachalsky et al. (1993) studied this question.
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