Fig. 6. Early segmental expression of hoxa2, hoxb2 and hoxb3 is altered in spg^m793 mutants. Wild-type (A,C,E,G,I,K,M,O,Q,S) and spg^m793 mutant embryos (B,D,F,H,J,L,N,P,R,T) at the 100% epiboly (M,N,Q,R), 2-somite (A,B,E,F,I,J,O,P,S,T) and 5-somite (C,D,G,H,K,L) stages showing expression of hoxa2 (A-D), hoxb2 (E-H), hoxb3 (I-L), hoxb1b (M-P), and hoxb1a (Q-T) (WISH; purple/blue). To identify spg mutants, pax2.1 (A,B,E,F,I,J,M,N,Q,R) or krx20 (O,P,S,T) expression (red) was also assayed. All panels show dorsal views, anterior is to the left (A-L) or up (M-T). 2-6, rhombomeres 2-6.

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