Which sequence correctly illustrates the protein interactions in the RAS pathway?

• A. IRS 1 -> GRB 2 -> SOS -> Ras
• B. Ras -> SOS -> GRB 2 -> IRS 1
• C. SOS -> IRS 1 -> GRB 2 -> Ras
• D. GRB 2 -> IRS 1 -> Ras -> SOS

Answer: (A)