CTBP2 and retinal degeneration: In P60 RCS rats, as retinal degeneration advanced, the proportion of mGluR6-positive RBC ectopic dendrites in the RBCs was 94.4% ± 3.9% and the proportion paired with CtBP2 puncta (indicated by the arrows in Fig. 2b) increased significantly to 81.4% ± 8.2%.