A simple method for examination of polymorphisms of catalase exon 9: rs769217 in Hungarian microcytic anemia and beta-thalassemia patients

► Electrophoresis of PCR amplicons of catalase exon 9 showed unusual bands in 400-800 bp region. ► They might be further existing single strands due to internal base pairing. ► Their unique electrophoretic pattern may be used for examination of polymorphisms in catalase exon 9.