The resulting odd electron metal peptide complex then fragments to yield {HEAD ~ diagnostic fragment ions} observed in {TAIL ~ the mass spectrometer} 
observed in
The resulting odd electron metal peptide complex then fragments to yield { HEAD ~ diagnostic fragment ions } observed in { TAIL ~ the mass spectrometer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL