All 5–HT receptors are heptahelical serpentine receptors

All 5–HT receptors are heptahelical serpentine receptors EXCEPT :

    1. 5–HT1
    1. 5–HT2
    1. 5–HT3
    1. 5–HT4

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EXP:

All serotonin receptors are G-protein coupled receptors except 5-HT3, which is an isotropic receptor.