HRH2 and brain disorder: These included Ihh (Indian hedgehog; CvN), related to “cell–cell adhesion” and “brain diseases” (Table 5), Hrh2 (histamine receptor H2; CvA), and Htr2c (serotonin receptor 2C; CvI), both related to important categories of GO processes and diseases (Table 6 and Table 7).