evolutionary studies strongly suggest that the parent rna for the alu-like elements is the highly conserved 7sl rna , which is an essential component of signal recognition particle ( srp ) , a small cytoplasmic ribonucleoprotein whose function is the targeting of nascent secretory and membrane proteins to the rough endoplasmic reticulum ( for a review see ref . 6 ) .
C0010834
cytoplasmic
C1325633
membrane