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