These may include, for example, {TAIL ~ chalcone synthase} of {HEAD ~ petunia} or polygalacturonase of tomato  
These may include , for example , { TAIL ~ chalcone synthase } of { HEAD ~ petunia } or polygalacturonase of tomato
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH