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