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ETD tandem mass spectrum of doubly protonated SGR(Me)GK. Precursor ion is denoted as “2+”, and the undetected charge-reduced precursor is only signed as M. Hydrogen atom loss is depicted as ’. Neutral losses of ammonia (*) and the NG-methylarginine-selective methylamine (÷) and N-methylcarbodiimide losses (§) are also shown. For ease of interpretation, precursor intensity is reduced to 1/100 of its original value.
