Son of Sevenless Protein, Drosophila

**Definition:** A guanine nucleotide exchange factor from DROSOPHILA. Sevenless refers to genetic mutations in DROSOPHILA that cause loss of the R7 photoreceptor which is required to see UV light.

**Tree numbers:** - D12.644.360.325.300.700.700.600 - D12.776.476.325.300.700.700.600

**Synonyms:** - SOS Protein - Drosophila Son of Sevenless Protein - Drosophila SOS Protein