Son of Sevenless Protein, Drosophila

Drosophila SOS Protein; Drosophila Son of Sevenless Protein; Protein, Drosophila SOS; SOS Protein, Drosophila
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.