Pre-treatment of isolated RGCs with anti-Gbg peptide reduced calcium channel suppression by L-803,087. (A) Calcium channel currents recorded from an isolated RGC pretreated with a combination of anti-Gbg peptide (1 mM) in the absence (black) and presence of L-803,087 (gray, 10 nM). (B) The mean data show that L-803,087 reduced calcium channel current in cells pre-treated with anti-Gbg peptide (n = 10, *P < 0.05, 2 way RM ANOVA).