
Motif length and coding capabilities as determinants of STR variability. STR heterozygosity monotonically decreases with motif length for noncoding loci and is generally reduced in noncoding (left) versus coding regions (right). The box extends from the lower to upper quartiles of the heterozygosity distribution, and the interior line indicates the median. The whiskers extend to the most extreme points within 1.5*IQR of the quartiles.











