Immonoblots of monkey brain tissues and crude membranes of recombinant Sf9 cell lines expressing dopaminergic human D1, D2S, D2L, D3rat, D4.2, and D5 receptors are shown with D2S (a) and D2L (b) antibodies. Both antibodies immunoreacted with single polypeptide band and do not show cross-reactivity. The relative abundance of the D2S and D2L receptor isoforms in the same strip (c) is shown.