Fig. 9. Comparison of survival in cultures infected with RCAS::Hoxa2 and RCAS::Hoxd10 and treated with FGF2 or BMP2. Survival of Hoxa2- expressing cells is increased relative to uninfected cranial neural crest cells whereas survival of Hoxd10- expressing cells increased almost fivefold and became markedly more similar to that of trunk neural crest (t-test: P<0.001 for all pairwise comparisons with a control). All are significantly different except Hoxa2+FGF2.