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... vas deferens and urinary bladder. ... 5-HT/serotonin: 5-HT3 (A) GABA: GABA A (?1, ?2, ?3, ?4, ?5, ?6, ?1, ?2, ?3, ?2, ?3, ?, ?, ?), GABA C (?1, ?2) ...
http://en.wikipedia.org/wiki/P2X_receptor
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