http://64188.org/story.php?title=s-for-instance-the-eukaryotic-mitogen-activated-protein-map-cascade-is-an S. For instance, the eukaryotic mitogen-activated protein (MAP) cascade is an illustrious example of a tricyclic phosphorylation cascade (619). With respect to ammonium metabolism in E. coli, covalent modification is known to play a prime role in its regulation. Adenylylation of GS, uridylylation of GlnB and of GlnK, and phosphorylation of NRI and of NRII are the three relevant covalent modificati Tue, 31 Jan 2023 12:44:12 UTC en