Microarray probes. Species with only one representative sequence were easy to design probes for. However, it is more challenging to find probes that were unique within species but capable of distinguishing between species when that species has several known haplotypes. Data is from 150 bases of the 5' region of COI (A) and cytb (B).
Hajibabaei et al. BMC Biology 2007 5:24 doi:10.1186/1741-7007-5-24