APS bound to KIT is phosphorylated by tyrosine kinases in response to SCF stimulation (Wollberg et al, 2003). The C-terminal tyrosine 629 may be the target site of phosphorylation in APS (Wakioka et al, 1999).
Wakioka, T, Sasaki, A, Mitsui, K, Yokouchi, M, Inoue, A, Komiya, S, Yoshimura, A
Wollberg, P, Lennartsson, J, Gottfridsson, E, Yoshimura, A, Rönnstrand, L
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