{HEAD ~ a source} of {TAIL ~ energy} sufficient to heat tissue to form a denatured proteinaceous substance; and 
of
{ HEAD ~ a source } of { TAIL ~ energy } sufficient to heat tissue to form a denatured proteinaceous substance ; and
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH