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Skeletal preparations of hindlimbs of wild-type and Fgf8 null mice (A) and wild-type and Fgf8 mutant zebrafish pectoral fins (B). While the hindlimbs of Fgf8 null mice have skeletal outgrowth defects, the pectoral fins of Fgf8 mutant zebrafish develop normally (figure reproduced with permission from Lewandoski et al. 2000 and Reifers et al. 1998).
