Both of these proteins, are tumor suppressors, meaning they help slow down cell growth and prevent tumors.

这些蛋白都是肿瘤抑，助抑细胞生长，阻止肿瘤发生。

So oncogenes or mutated tumor suppressor genes allow cells to keep growing uncontrollably resulting into tumors.

因，癌基因或突变的抑癌基因使细胞不地增长，导致肿瘤发生。

Thus, tumors of mature muscle or nerve cells do not occur, although tumors of less differentiated myoblastic or neuronal stem cells do.

因，尽管有肿瘤发生在分化程度较低的成肌细胞或神经干细胞，但不会发生成熟肌肉或神经细胞的肿瘤。