Homology of human, caprine, porcine and mouse SRY 5' sequences to bovine SRY. Pink shading indicates 70% or higher homologies calculated over 100 bp. Peaks of homology are labelled Region A to D above the graph. Repetitive elements (LINEs and SINEs) are indicated in green, and the SRY coding region in blue. Grey line below each graph shows the extent of sequence used.