STAP-2/BKS, an adaptor/docking protein, modulates STAT3 activation in acute-phase response through its YXXQ motif.
Minoguchi M, Minoguchi S, Aki D, Joo A, Yamamoto T, Yumioka T, Matsuda T, Yoshimura A, J Biol Chem, 2003 Mar 28 - link

The adapter protein APS associates with the multifunctional docking sites Tyr-568 and Tyr-936 in c-Kit.
Wollberg P, Lennartsson J, Gottfridsson E, Yoshimura A, Ronnstrand L, Biochem J, 2003 Mar 15 - link