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Xenopus laevis has an allotetraploid genome of 3.1Gb, in contrast to the diploid genome of a closely related species, Xenopus tropicalis. Here, we identified 412 genes (189 homeolog pairs, one homeologous gene cluster pair, and 28 singletons) encoding transcription factors (TFs) in the X. laevis genome by comparing them with their orthologs from X. tropicalis. Those genes include the homeobox gene...