The signal recognition particle (SRP) is a multimeric protein involved in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP14 and SRP9 form a complex essential for SRP RNA binding.

1: The crystal structure of the signal recognition particle Alu RNA binding heterodimer, SRP9/14. Birse DE, Kapp U, Strub K, Cusack S, Aberg A; EMBO J 1997;16:3757-3766. PMID:9233785