Figure 4M. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(01)00430-0] Mech Dev 106: 175-80, Vargesson N; Luria V; Messina I; Erskine L; Laufer E, "Expression patterns of Slit and Robo family members during vertebrate limb development." Copyright 2001. [PMID:11472852]