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