. . . . . . . . "MSH: The complete genetic complement contained in the DNA of a set of CHROMOSOMES in a HUMAN. The length of the human genome is about 3 billion base pairs.,NCI: The total gene complement, about 3 billion base pairs of DNA, contained in the human chromosomes." . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .