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. 2020 Jan 21;31(3):565–573. doi: 10.1021/jasms.9b00036

Figure 2.

Figure 2

ETD tandem mass spectrum of doubly protonated SGXGK (A) and SGRGK (B). Precursor ions are denoted as “2+”, and the undetected charge-reduced precursors are only signed as M. Hydrogen atom loss is depicted as ’. Neutral losses of ammonia (*), CO (#), and the citrulline-selective carbamoyl radical (currency sign) and urea loss (u) are also shown for SGXGK along with arginine-selective carbamimidoyl radical (×) and carbamidine (Euro sign) for SGRGK. For ease of interpretation, precursor intensities are reduced to 1/100 of their original value.