Is G1 normally distributed?

The normal distribution parameters were calculated for seven sets of cell cycle data of animal cells in culture. These include two sets of intermitotic times (rat S6/1 cells and mouse fibroblast L 929) and five sets of DNA synthesis (two of mouse fibroblast line L 929, two Chinese hamster CHO lines and Syrian hamster line BHK 21/613).It is demonstrated that within the errors involved the experimental data fit the normal distribution adequately. The Smith-Martin model and the normal distribution are briefly discussed in relationship to the initial curvature observed in a semilogarithmic presentation of such data.