Tempus stands out from the crowd because it uses what’s called “whole exome sequencing.” A strand of DNA contains exons, which are the coding sites—the sites that dictate the action—as well as introns, whose function is debated. Right now the intron seems to be a spectator to the action, but nature rarely creates spectators, so some essential function will likely be found. But we know for sure the exons matter a lot. Taken together, the exons form an exome.
