?:definition
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OBSOLETE. The endonucleolytic cleavage of a mRNA containing an HAC1-type intron at the 5\' and 3\' splice sites. The cleavage step is part of unconventional mRNA splicing, and contributes to the endoplasmic reticulum unfolded protein response. [GOC:bf, GOC:krc, GOC:mah, PMID:10357823]
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