Very little is known about the roles of {HEAD ~ four other SIR2 family members} found in {TAIL ~ yeast} , nor about the function of homologs from other species 
found in
Very little is known about the roles of { HEAD ~ four other SIR2 family members } found in { TAIL ~ yeast } , nor about the function of homologs from other species
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH