The pro form includes an N terminal signal peptide for {HEAD ~ directed secretion} of {TAIL ~ the extracellular domain}, while the full length mature form lacks this signal sequence 
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The pro form includes an N terminal signal peptide for { HEAD ~ directed secretion } of { TAIL ~ the extracellular domain } , while the full length mature form lacks this signal sequence
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH