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