Fig7d. Copyright: Reprinted with permission from Cell Press from [doi:10.1016/0092-8674(94)90408-1] Cell 79(1): 157-68, Cheng HJ; Flanagan JG, Identification and cloning of ELF-1, a developmentally expressed ligand for the Mek4 and Sek receptor tyrosine kinases. Copyright 1994 [PMID:7522971]