In BTK, phosphorylated Y223 in the SH3 domain mirrors catalytic activity, but does not influence biological function.
Estupiñán HY, Bouderlique T, He C, Berglöf A, Cappelleri A, Frengen N, Zain R, Karlsson MCI, Månsson R, Smith CIE. Blood Adv. 2024 Apr 23; 8(8):1981-1990.