Fig. 2. The expression of her6 within the paraxial mesoderm is under the control of the Notch pathway. Two-cell stage embryos were injected in one cell with a dominant-blocking (A) or a constitutively active (B) form of the Notch effector Suppressor-of-Hairless [Su(H)] and analysed at 6- to 10-somite stage. In both A and B, the injected side is on the right, the control non-injected side is on the left. Anterior is towards the top. her6 is ectopically expressed throughout the PSM in embryos injected with the active form Su(H)Ank (B) and downregulated in both the anterior PSM and the segmented paraxial mesoderm in embryos expressing the dominant blocking Su(H)DBM (A).