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Antihistamines block the actions of histamine at the 1. H1 receptor site. 2. B1 receptor site. ...

tyannaaaa

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Antihistamines block the actions of histamine at the 1. H1 receptor site. 2. B1 receptor site. ...

Antihistamines block the actions of histamine at the

1. H1 receptor site.
2. B1 receptor site.
3. B2 receptor site.
4. C1 receptor site.

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