Copy number changes in chromosome 8. Relative copy number was analyzed for the sequences on chromosome 8. The results of the arrayCGH experiments are shown with three breast cancer cell lines: MCF7 (top), MDA-MB-468 (middle), and BT-20 (bottom). The entire length of chromosome 8 is 146,274,826 base pairs, and the centromeric region is located between 44 and 47 Mb from pter.