Hybridization of PKD1 probes on gorilla and orangutan chromosomes. One- and two-colour FISH of human BAC clone RP11-304L19 (BAC) and PKD1-cDNA clone (cDNA) to meta- and prometaphase chromosome 16 of the gorilla (GGO) (a-c) and to meta- and prometaphase chromosome 16 of the Sumatran orangutan (PPYsu) (d-f). The colours of the inserted clone names correspond to those of the fluorescence signals (see Fig.1) on the DAPI-counterstained plates. "ph" stands for short arm heterochromatin. Centromeres are marked by small bars.