Spectrast.usermods

From SPCTools

# spectrast.usermods
# This file should contain specifications of amino acid modifications of peptides. 
# Specifications are of the form <amino acid>[<tag>]|<mass change>|<mod type>. For example,

M[foo]|+12.34567|MyMod

# Note that tag and mod type must not start with a number, and should not contain space or special characters

# Leave blank the [<tag>] unless you have a strong reason to do so. SpectraST will construct one that conforms to TPP convention. 
# (Note that some components of TPP may fail if you specify your own tag.) For example,

C|+57.021464|Carbamidomethyl

# Leave blank the mod type if you don’t know a good name for it, or don’t know if the mod is already encoded in SpectraST. For example,

M|+16|

# SpectraST should recognize this is oxidation and use the accurate mass (+15.99491) accordingly.