SOS1 Protein

**Definition:** A mammalian homolog of the DROSOPHILA SON OF SEVENLESS PROTEIN. It is a guanine nucleotide exchange factor for RAS PROTEINS.

**Tree numbers:** - D12.644.360.325.300.700.700.630 - D12.776.476.325.300.700.700.630

**Synonyms:** - mSOS1 Protein - Son of Sevenless Homolog 1