Human chromosome, coloured scanning electron micrograph (SEM). Chromosomes, which consist of two identical chromatids joined at a centromere, are comprised of deoxyribonucleic acid (DNA) and proteins. DNA contains sections, called genes, which encode the body's genetic information. Humans have 23 pairs of chromosomes. Magnification: x7000 when printed 10 centimetres tall. | |
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