Which sequences signal the start of RNA splicing?

• A. AG at the 5' splice site and GU at the 3' splice site
• B. AC at the 5' splice site and AU at the 3' splice site
• C. GU at the 5' splice site and AG at the 3' splice site
• D. AU at the 5' splice site and AC at the 3' splice site

Answer: (C)