Fig 1C. Copyright: This image is from Ivkovic S; Yoon BS; Popoff SN; Safadi FF; Libuda DE; Stephenson RC; Daluiski A; Lyons KM, Development 2003; 130(12):2779-91 [doi:10.1242/10.1242/dev.00505] and is displayed with the permission of The Company of Biologist Limited who owns the Copyright. [PMID:12736220]