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Fig. 4. Expression patterns of Lfng (A), Delta1 (B) and Notch1 (C) mRNAs in the anterior PSM of E2 chicken embryos. The sharp anterior boundary of the Lfng-expressing area demarcates the prospective line 1. Red and black arrowheads indicate levels 0 and 1, respectively. (A-C) A dorsal view with anterior at top. (A'-C') A sagittal section of the same specimen shown in A-C with anterior at left.
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