||This was not a
surprising conclusion because all living organisms share a common ancestor.
However, we did not know how conserved the machinery would be. We did not
know that a newly sequenced gene from nearly any organism would be seen to
fit into a family of proteins like kinases, myosins, or anthranylate
synthetases. Indeed, the molecular conservation of many of the proteins
involved in the cell cycle and in cell cycle checkpoints is not very evident
across the rokaryotic/eukaryotic boundary but within eukaryotes the
conservation is striking.