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