Figure 8. Validation of microarray data. Following 4 h of Ngn3-GR activation at Stage 12 candidate genes from the microarray analysis were increased in the endoderm at Stage 15: (a,b) tbx2 (n = 24/24). (c,d) mtg8 (n = 21/21). (e,f) hes3 (n = 14/42). (g,h) geminin (n = 13/44). (i,j) oct25 (n = 13/13). And at Stage 20: (k,l) mtgr1 (n = 9/13). Dashed circles and arrows indicate ectopic expression in the anterior endoderm. Dashed line indicates ectopic expression in the dorsal endoderm.