Insertion duplication in exon 6 of the PIG-A gene in patient MSK13. The sequence of 32 nt starting by 5′-TCAA-3 until 5′-CAA-3 in the normal control is replicated in MSK13, but after the insertion of two thymidines. The insertion-duplication introduces a frameshift at codon 452 and leads to the production of truncated PIG-A protein of only 462 AA.