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Fig. 5 Early expression of cxcr4b. A: expression is first detected in a cluster of placodal cells (arrow) in 19 hpf embryos. B: expression is much enhanced in 20 hpf embryos. C: by 22 hpf the primordium has made contact with the SDF1 trail and elongates into somite 1. D: at about the same time cxcr4 expression is down-regulated in a small cluster of cells near the presumptive trailing edge of the primordium (arrow).
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Full text @ BMC Dev. Biol.