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Cellular compartmentation of dipeptidyl peptidase (DPP)4‐like enzymes. DPP4 and fibroblast activation protein alpha (FAP) are located either as homodimers or heteromeric complex on the plasma membrane or shedded into the serum. DPP2, a homodimer, is distributed as a zymogen in secretory vesicles or lysosome. DPP8 and DPP9 are also homodimers and located cytosolically. 
, glycosylation.
