Animal cells: noncorrelation of length of G1 phase with size after mitosis.

The interval between mitosis and initiation of DNA synthesis (G(1)) varied over a fourfold range for Chinese hamster ovary cells, an established line. This was not because of size differences. Synchlronous cells of different sizes began DNA synthesis at similar times after mitosis. A novel technique of centrifugation for separating cells according to size is described.