Figure 2E. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(03)00113-8] Mech Dev 119 Suppl 1: S179-84, Coffinier C; Ketpura N; Tran U; Geissert D; De Robertis EM, Mouse Crossveinless-2 is the vertebrate homolog of a Drosophila extracellular regulator of BMP signaling. Copyright 2002.