Identification of metabolite peaks was based on mass accuracy and {HEAD ~ isomeric species} were assigned based on {TAIL ~ diagnostic fragment ions} present during tandem mass spectrometry for many of the identified metabolite peaks 
assigned based on
Identification of metabolite peaks was based on mass accuracy and { HEAD ~ isomeric species } were assigned based on { TAIL ~ diagnostic fragment ions } present during tandem mass spectrometry for many of the identified metabolite peaks
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH