Fig3. Copyright: This image is from Hulander M; Kiernan AE; Blomqvist SR; Carlsson P; Samuelsson EJ; Johansson BR; Steel KP; Enerback S, Development 2003;130(9):2013-25 [doi:10.1242/dev.00376] and is displayed with the permission of The Company of Biologist Limited who owns the Copyright. [PMID:12642503]