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