Genome is the whole compliment of genetic material in the form of the permanently maintained DNA for the particular given organism. Its size is usually given as its total number of its base pairs. Mammalian genomic DNA (including of the humans as well) contains 6 billion base pairs of the DNA per diploid cell. There are somewhere in order of a hundred thousand genes, comprising coding regions, 5' and 3' untranslated regions, introns, 5' and 3' flanking the DNA. It is also present in the genome are structural segments such as the telomeric and centromeric DNAs and replication origins, and an intergenic DNA.