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. 2022 May 5;9:897621. doi: 10.3389/fmolb.2022.897621

FIGURE 4.

FIGURE 4

ESI-MS spectra of Ctr11-14 treated with 1 and 2 eq of CuSO4 (A,C)and magnification of the doubly charged peaks (cyan and blue dashed boxes) displayed in (B,D), respectively; the insets show the calculated isotopic distributions. (E) Intensity of doubly charged ESI-MS peaks of different Ctr11-14 species as a function of Cu(II):peptide ratio.