Fig. 4. Model of progressive transdifferentiation in the or^J mutant. (A) Representative sections through E14.5 or E17.5 embryos that were or^J/+ heterozygotes or or^J/or^J homozygotes, as indicated, pseudocolored for expression of peripheral genes in zone 1 (green), zone 2 (red), zone 3 (blue), or zone 4 (magenta). Regions of tissue co-expressing zone 1 and zone 2 markers are pseudocolored as yellow/orange. (B) Tabular summary of some expression patterns shown in Figs 3, 4, S1 and S2 (supplementary material).