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