Families used in class A alignment

129 Visual Opsins

Vertebrate subtypes 1, 2, 3, 4, 5, mollusk and arthropod visual rhodopsin

69 Bioamine receptors

Alpha1, alpha2, beta1, beta2, beta3 adrenergic, vertebrate dopamine subtypes 1, 2, and histamine subtype 1

58 Olfactory receptors

Olfactory types 1,2,5,6

82 Chemokine receptors

Angiotensins type 2, interleukins type A, B, C-C chemokine type 1, 2 and 3, bradykinin type 1 and 2,
thrombin, fMLP, C5a anaphylatoxin and somatostatin type 1, 2, 4, 5 receptors