PCR primers closely flanking the repeat region were redesigned to reduce th
e amplicon length of the selected STRs down to approximately 100 bp for the
shorter alleles (loci HumTH01, D10S2325, DYS19 and DYS391). Highly degrade
d DNA (e.g. formalin-fixed tissue) and very low amounts of DNA could be mor
e successfully typed using the new redesigned primers compared to the estab
lished sequences generating longer amplicons.