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Why does DRB1/3/4/5 show ‘No typing result available’?

We use the GenDx NGSengine application for HLA typing and HLA report generation. The HLA loci DRB3, DRB4 and DRB5 are paralogs of locus DRB1.  Thus, they share a significant fraction of their genetic sequence with DRB1. The NGSengine HLA…