Fig. 1. Electroporation strategies used to transfect distinct somite domains. (A-D) Electroporation of pioneers (A), dermomyotome sheet (B), dorsomedial lip (C), and rostral and caudal lips (D, only rostral is depicted, the location of the positive electrode is changed to the opposite edge for caudal transfections). The shapes and placement of the electrodes are drawn in white. Arrows indicate the direction of the current; red blocks represent the targeted domains.