Fig. 7. Control (A-L) or morpholino-injected (M-) embryos hybridised with probes against deltaC (A-K,M-T',Y-ß) or her1 (I-L; U-X; ,) at different time points. (A-L) In control embryos, stripes of deltaC and her1 are maintained throughout somitogenesis. (D',D'') Higher magnifications of the boxed areas in the anterior and posterior PSM, respectively, of the embryo in D. (I') High magnification of the boxed area in I. (M-X) In embryos injected with 3 ng her6MO+3 ng her4MO, the periodicity of deltaC and her1 expression breaks down between 8 and 10 ss and is lost by 14 ss. deltaC stripes become blurred between 8 and 10 ss (M-O). Between 10 and 14 ss, the anterior stripes fuse (P,Q), lose their homogeneous character (compare R', a magnification of the boxed area in R, with D') and are replaced by an irregular domain expressing deltaC at different levels (S,S',T,T'). (S',T') Higher magnifications of the boxed areas in the anterior PSM of S and T. (S'') Higher magnification of the posterior boxed area in S, showing that an irregular deltaC pattern is also found in the posterior PSM (compare S'' with D''). her1 stripes become blurred around 10 ss (compare V,V' with I,I') and by 14 ss a mixture of cells expressing her1 at different levels is found throughout the PSM (W-X). (Y-) In embryos injected with 6 ng her6MO the periodicity of deltaC expression is maintained at 14 ss (Y), breaks down around 20 ss (Z) and is lost by 26 ss (). (,) disruption of her1 starts around 18 ss and is complete by 26 ss. (ß) In an embryo injected with 3 ng her6MO, only weak deltaC abnormalities are visible at 26 ss.