H1 receptor binds histamine
type: GO_0003674
BFO_0000050: Histamine receptors
directly activates: BiochemicalReaction4361

H2 receptor binds histamine
type: GO_0003674
BFO_0000050: Histamine receptors
directly activates: BiochemicalReaction4341

H3 and H4 receptors binds histamine
type: GO_0003674
BFO_0000050: Histamine receptors
directly activates: BiochemicalReaction4348

Histamine receptors
type: GO_0008150