The proximal portion is located proximally of the distal portion, and {HEAD ~ a junction member} is preferably located between {TAIL ~ both portions} 
is preferably located between
The proximal portion is located proximally of the distal portion , and { HEAD ~ a junction member } is preferably located between { TAIL ~ both portions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL