6. Contactin‐1 downregulated in mouse model infected with malaria (Desruisseaux et al. 2010); contactins 3,5 inferred under selection in low‐elevation 'amakihi (Cassin‐Sackett, Callicrate, and Fleischer 2019); contactin 4 was a candidate malaria resistance locus in humans (Damena et al. 2021). The gene discussed is CNTN4; the disease is malaria.