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Did homeobox gene duplications contribute to the Cambrian explosion?

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Figure

Figure 1 Tandem homeobox gene duplication and recruitment to body patterning. Tandem duplication of homeobox genes in earlymetazoan evolution generated ProtoNK and ProtoHox genes (black boxes), plus neighbouring homeobox genes (grey boxes)
Figure 3 Expression of ParaHox genes in trochophore larva of a molluscgene expression in stomodeum or mouth (yellow arrowhead) plus the apical sensory organ (black arrowhead) and two groups of cells markingthe developing cerebral ganglion (red arrowheads).

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