PKN2 and osteopetrosis: The results of our igeGWAS and fine-mapping analyses identified a single putative causal gene at seven IGE loci: Abca12 at a locus for adult neurogenesis; Epha4 at a locus for stress-coping strategy; Pkn2, Slit3, and Pgk1-rs7 at three different loci for sleep; H60c at a locus for home cage activity; and Adcy1 at a locus for osteopetrosis.