Figure. Evaluation of sensitivity of multiple site–specific heteroduplex tracking assay (MSS-HTA). A) MSS-HTA tested against known concentrations of Plasmodium falciparum DNA. Visible bands representing mutant DNA remain until the 1% population (lanes N and O). B) the same dilution series assayed with allele-restricted PCR (ARPCR), where visible mutant bands (366 bp) are not seen past the 20% mutant population (lanes I and J). The lanes marked with W and M represent wild-type and mutant restricted reactions, respectively. HTA, heteroduplex tracking assay; *, base pair ladder; P, probe alone.