Fig. 1. Expression of Lmx1a in developing spinal cord. Lmx1a expression (red) alone (A,B,E) or together with Slug (C,F,H), and MafB (D,G,I) (both green) in chick developing spinal cord at the stages indicated. (A) Arrows point to neural folds expressing Lmx1a; n, notochord. (F) Asterisk indicates dorsal midline cells that co-express Lmx1a and Slug. Arrowheads point to Slug-positive/Lmx1a-negative cells delaminating and migrating away from the neural tube.