Table 2. Ratio of Se/S substitution in EF1-α sulfur-containing peptides.

Cysteine-containing peptides are in light grey boxes. Sulfur-containing residues are in bold.

*Peptides resulting from specific cleavage only at one terminus.

^aXIC peak areas for peptides 110–117 were above limit of detection (LOD) but lower than limit of quantification defined as LOQ = 3 X LOD.