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