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Fig. 7. Notch/Lfng acts directionally on the anteriorly located cells. (A) When Lfng-producing cells were located in the anterior half of a host somite, the interface (arrow) did not induce a fissure. (B) When a ‘strip’ of Lfng-producing cells was positioned in the middle of a host somite, only the anterior (arrowhead) but not the posterior (arrow) interface produced an ectopic fissure.





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