Choices of antibodies of your interest could be different depending upon the way you prepare your sections either fixed or frozen.

For fixed sections:

1. Anti-Gi Alpha 1/2 Antibody (aa345-354) IHC-plus™ LS-B750, Life Span Biosciences, USA

2. G0 Protein alpha Antibody (NBP2-16703), Novus Biologicals, USA

3. Gα q/11/14 (H-300) (sc-28587), Santa Cruz Biotechnology, USA

For frozen sections:

1. No good Gi alpha antibody is available but you can give a try with aa345-354

2. No good G0 alpha antibody is available but you can give a try with NBP2-16703

3. No good Gq alpha antibody is available but you can give a try with sc-28587

Best-

Thank you very much!