Assertion: cell wall's protein | /r/HasAspect | a signal sequence
Facets:
Source sentences:
text: Ribosomes on RER, which give RER its rough appearance, specialize in the synthesis of proteins that possess a signal sequence that directs them specifically to the ER for processing.
text: The ribosomes on rough ER specialize in the synthesis of proteins that possess a signal sequence that directs them specifically to the ER for processing.