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