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(a) The 22 chromosomes of a normal CHE cell. (b) The 19, 20, and more than 100 chromosomes of cells from the dimethylbenzanthracene-transformed colony D42. (c) The 34 chromosomes of a cell from the methylcholanthrene-transformed colony M34. (d) The 41 chromosomes of a cell from the benzo[a]pyrene-transformed colony B6.
