Summarized scheme showing Drd1a-tdTomato expression in each type of bipolar cell. Orange; tdTomato positive, type 1, 3b, 4, 5-2, XBC, 6, and 7 bipolar cells. Black; tdTomato negative, type 2, 3a, 5-1, 9, and rod bipolar cells, Gray: not studied, type 8. The table summarizes each type bipolar cell function. u.k.: unknown *, types receiving mixed rod and cone inputs (Mataruga et al., 2007; Tsukamoto et al., 2007; Haverkamp et al., 2008); **, chromatic characterization in each type (Breuninger et al., 2011; Ichinose et al., 2014); ***, temporal properties of each type (Euler and Masland, 2000; Ichinose et al., 2014; Ichinose and Hellmer, 2015).