When we realized this, we were able to find hundreds of cell cycle mutants in a few months. C.F. Robinow agreed to visit the lab and teach us how to stain the nuclei of cells, and Joe Culotti, a new graduate student, was able to show that the mutants that arrested with a uniform cell morphology also arrested with a uniform nuclear morphology. At this point we were excited that we had some very interesting mutants and we were confident that they would reveal new insights into the cell cycle.