Homology, used {HEAD ~ interchangeably herein} with {TAIL ~ the term identity} refers to sequence similarity between two protein or between two nucleic acid molecules 
with
Homology , used { HEAD ~ interchangeably herein } with { TAIL ~ the term identity } refers to sequence similarity between two protein or between two nucleic acid molecules
OTH OTH OTH 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