The DNA was taken from a thoroughbred mare, called Twilight, and then the nucleotide sequence was determined, one after another – in all, almost three billion bases. It shows us where are located repetitive sequences, where are located genes which encode proteins, and how are these genes organized. Are they structured the same way as similar genes in humans, or are they different, and much, much more. What is causing the small size of a horse? We don’t know exactly. And so on, there are many other interesting traits, and of course disease conditions of interest.