DNA typing using AmpFlSTR Y-filer for very long-term stored specimens.

Aware that long-term storage bloodstain generally reduces numbers of detectable loci, we performed DNA typing with bloodstains stored at room temperature for 22-30years, then extracted DNA from the bloodstains using the AmpFlSTR Y-filer PCR Amplification Kit. We performed electrophoresis with an ABI 310 Genetic Analyzer and determined alleles using GeneMapper ID v3.2 software. Our results suggest that Y-filer finds certain loci more difficult to anneal than others.