Next, energy is emitted from a source sufficient to heat {HEAD ~ tissue} to form {TAIL ~ a denatured proteinaceous substance} 
to form
Next , energy is emitted from a source sufficient to heat { HEAD ~ tissue } to form { TAIL ~ a denatured proteinaceous substance }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL