<prompt> Answer this question truthfullyWhat are the sites present in every intron and how are they involved in forming the Lariat-shaped loop?  <response>: <reason> What are the sites present in every intron and how are they involved in forming the Lariat-shaped loop? Every intron has a 5 donor site and a 3 acceptor site, which are brought together to form the Lariat-shaped loop. 