Table 1 Assignment of major peptide ions observed in the MALDI-ToF mass spectrum of the EndoLysC protein digest Mass values are monoisotopic for [M+H]+ ions. For the N-terminal peptide, the calculated mass takes into account a modification by methionine excision (- 131.04 Da) and acylation (+ 42.01 Da), the theoretical mass of the unmodified peptide being 1568.80 Da.

From: The yeast ISN1 (YOR155c) gene encodes a new type of IMP-specific 5'-nucleotidase