Fig 2C. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(99)00193-8] Mech Dev 89: 155-9, Kanai-Azuma M; Kanai Y; Okamoto M; Hayashi Y; Yonekawa H; Yazaki K, Nrk: a murine X-linked NIK (Nck-interacting kinase)-related kinase gene expressed in skeletal muscle. Copyright 1999