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Comparison of the amino acid sequences of three Xenopus phds. Stars indicate identical amino acids in all three phds. Hyphens represent gaps introduced for optimizing the alignment. Dashed rectangles demarcate the highly conserved prolyl 4 hydroxylase domain. ID stands for the percentage of amino acid identity of Xenopus laevis phd1 in comparison with Xenopus phd2 and phd3.
