For example, dysfunction of ADGRG1/GPR56 causes polymicrogyria (Piao et al., 2004), ADGRF5/GPR116 controls pulmonary surfactant production (Bridges et al., 2013), genetic lesions in many aGPCR loci are associated with a roster of cancer types (Kan et al., 2010; O'Hayre et al., 2013) and ADGRE2/EMR2 regulates mast cell degranulation (Boyden et al., 2016). The gene discussed is ADGRE2; the disease is polymicrogyria.