性做久久久久久坡多野结衣-性做久久久久久久久浪潮-性欲影院-性影院-国产精品线路一线路二-国产精品兄妹在线观看麻豆

Tyrosine phosphorylation refers to the addition of a phosphate group to the hydroxyl oxygen of the tyrosine amino acid residue in a protein. This process is catalyzed by specific kinases, such as protein tyrosine kinases （PTKs）, which transfer the gamma phosphate group of ATP to the tyrosine hydroxyl group. Tyrosine phosphorylation is involved in the regulation of protein function, activity, and localization. It plays a key role in signal transduction pathways, mediating cellular responses to extracellular stimuli.