providing {HEAD ~ an effective amount} of {TAIL ~ a photosensitive agent} to the vessels and thereafter activating said agent in said vessels with a low energy light sufficient to damage said vessels, and 
providing { HEAD ~ an effective amount } of { TAIL ~ a photosensitive agent } to the vessels and thereafter activating said agent in said vessels with a low energy light sufficient to damage said vessels , and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH