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Comparison between human (Upper) and rat (Lower) XLαs peptide sequences. Extensive homology is confined to the three shaded regions, whereas, as discussed in the text, the central repetitive region aligns poorly between species. Translation of the human exon has been started at position 318 relative to the SacI site (AJ224868). However, the true translation initiation site has not been defined experimentally either for human or rat XLαs (8).
