Additionally, the mediumblue module (Pvalb subtypes, 173 genes), while not passing the test for associating more strongly with epilepsy than with any sample, included the genes GRIK1, GRIK2, GRIK4, GRM1, GRM7, and GRIA1, suggesting a potential involvement in glutamate receptor subunits. The gene discussed is GRIK4; the disease is epilepsy.