The protein kinases of budding yeast: six score and more.

The completion of the budding yeast genome sequencing project has made it possible to determine not only the total number of genes, but also the exact number of genes of a particular type 1-3. As a consequence, we now know exactly how many protein kinases are encoded by the yeast genome, a number of considerable interest because of the importance of protein phosphorylation in the control of so many cellular processes.