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Human chromosomes. Coloured Light Micrograph of human chromosomes beside a cell nucleus (at far right). These thread-like structures occur in the nucleus of every cell, and appear in this shape during cell division. In this sample the chromosomes have been stained with Giemsa to reveal a pattern of bands on each one. Chromosomes carry a person's genetic information. Each consists of two strands (chromatids) joined in a region known as the centromere. Chromosomes make exact copies of themselves while the cell is resting between cell divisions. When a chromosome divides, the centromere splits longitudinally. Magnification: x1,000 at 6x7cm size.
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