Phosphorylation of CheY regulates which direction a flagellum rotates, thus controlling whether an organism runs or tumbles. The phosphorylation of CheY together with the co-regulation of acetylation is used as a response regulator for the Escherichia coli, a bacterial flagellum.
He grouped the types of creatures according to their similarities: animals with blood and animals without blood, animals that live on water and animals that live on land.
