(A) Gel chromatograph of PCR products from a phylogenetic analysis of a chimpanzee-specific NCAI locus (NCAI 6). The DNA template used is indicated at the top of each lane (H, human; C, chimpanzee; G, gorilla; O, orangutan; Rh, rhesus macaque; and Gr, African green monkey). (B) Schematic diagram of an example NCAI locus (NCAI 6) showing Alu insertion (green box) associated with 7bp deletion of target DNA (red box). Matching flanking sequence are shown as light blue boxes with pink sequence indicating exact sequence match at the ends of the indels. The yellow box indicates a small segment of non-Alu ‘filler’ DNA at the 3′ end of this NCAI insertion.