Agilent Spectrum Mill - MS Isotope

Isotope Distribution
Calculate masses as:
Peptide Sequence
Use CAPITAL letters for unmodified amino acids.
Use lower case letters for variable modified amino acids to indicate modification (eg. KCmqYQ).
Use 'u' for the user-specified aminio acid.
Sequence
User-specified AA elemental composition (u):
C: H: N: O: S: P: ( Default is Gly )
Modifications
Fixed:
Variable: