In this process the peptide of interest first binds to one of the metals present in the ESI capillary and then under CDSECSI conditions the metal is ionized and {HEAD ~ the metal peptide complex} becomes {TAIL ~ an odd electron cation} 
becomes
In this process the peptide of interest first binds to one of the metals present in the ESI capillary and then under CDSECSI conditions the metal is ionized and { HEAD ~ the metal peptide complex } becomes { TAIL ~ an odd electron cation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL