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G. Gs. -. +. +. +. +. ATP. [in IBP]. [in trachea an EPB only]. PG. L-type. P2X. P2Y. V. EP. PLC. AC. Gq. Na +. InsP 3. cAMP. PKA. Ca 2+. Ca 2+. SR. contractile apparatus. relaxation. contraction.
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G Gs - + + + + ATP [in IBP] [in trachea an EPB only] PG L-type P2X P2Y V EP PLC AC Gq Na+ InsP3 cAMP PKA Ca2+ Ca2+ SR contractile apparatus relaxation contraction