Term Name:	ER_retention_signal
Synonyms:	endoplasmic reticulum retention signal, ER retention signal
Definition:	A C-terminal tetrapeptide motif that mediates retention of a protein in (or retrieval to) the endoplasmic reticulum. In mammals the sequence is KDEL, and in fungi HDEL or DDEL.
Ontology:	Sequence Ontology [SO:0001806]