Son of Sevenless Homolog 1

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** Son of sevenless homolog 1 (1333 aa, ~152 kDa) is encoded by the human SOS1 gene. This protein is involved in the mediation of guanine nucleotide exchange for RAS superfamily proteins.

**Synonyms:** - Guanine Nucleotide Exchange Factor SOS1 - SOS-1 - SOS1 Guanine Nucleotide Exchange Factor