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SPRY4 is an inhibitor of the receptor-transduced mitogen-activated protein kinase (MAPK) signaling pathway. It is positioned upstream of RAS (see HRAS; MIM 190020) activation and impairs the formation of active GTP-RAS (Leeksma et al., 2002).
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Sasaki A, Taketomi T, Kato R, Saeki K, Nonami A, Sasaki M, Kuriyama M, Saito N, Shibuya M, Yoshimura A (May 2003). "Mammalian Sprouty4 suppresses Ras-independent ERK activation by binding to Raf1". Nature Cell Biology. 5 (5): 427–32. doi:10.1038/ncb978. PMID12717443. S2CID33846459.