Examples of DNA barcodes distinguishing sister species. Neighbor-joining tree constructed with K2P genetic distances. Fixed substitutions are represented by coloured boxes, with corresponding character positions relative to the beginning of COI. a) Phalaropes (Phalaropus); b) Penguins (Aptenodytes); c) Goldeneyes (Bucephala).
Tavares and Baker BMC Evolutionary Biology 2008 8:81 doi:10.1186/1471-2148-8-81