chif lies in the intron between exon 1 and exon 2 of Hyls1 and has four annotated isoforms. The 30-aa C-terminus specific to chif-RA is encoded by a short exon shared with part of exon 2 of Hyls1, and is deleted in Hyls156 mutants. This lesion in chif is designated chif56. The chif-RB and chif-RD isoforms are unaffected by this lesion and, because these isoforms are fully functional, the chif56 mutant should not affect chif function.
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