Upon {HEAD ~ UV illumination} the dye compounds display {TAIL ~ intense absorption} as well as visible fluorescence emission 
Upon { HEAD ~ UV illumination } the dye compounds display { TAIL ~ intense absorption } as well as visible fluorescence emission
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH