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T淋巴瘤侵袭转移诱导因子1 (T-lymphoma invasion and metastasis inducing factor 1, Tiam1)是Ras相关的C3肉毒素底物1 (Ras-Related C3 botulinum toxin substrate 1, Rac1)的特异性鸟苷酸交换因子(guanine nucleotide exchange factor, GEF).在细胞外信号刺激下Tiam1可以促进Rac1从无活性的GDP结合状态向有活性的GTP结合状态转换,有活性的Rac1-GTP