Hybridization of satellite DNA probes with chromosomes from four <i>Equus</i> species.

<p>Column 1: two color FISH on horse (A), donkey (B) Grevy's (C) and Burchelli's (D) zebras chromosomes. The FISH probes were the 37cen (green) and the 2PI (red) satellite DNA sequences; co-hybridization of both probes results in yellow signals. Column 2: horse (A), donkey (B), Grevy's (C), and Burchelli's (D) zebra metaphases hybridized in high stringency conditions with autologous genomic DNA, which identifies regions containing very abundant tandem repeats. Column 3: the same hybridization of column 2 performed in low stringency conditions. The white arrows in (A) point to chromosomes 11, which is the only horse chromosome pair lacking any hybridization signal.