Alternatively, other targeting devices may be used such as {HEAD ~ attachment} of {TAIL ~ the amplifier} to a porphyrin or other tumor seeking moiety 
of
Alternatively , other targeting devices may be used such as { HEAD ~ attachment } of { TAIL ~ the amplifier } to a porphyrin or other tumor seeking moiety
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH