modification1 <- msgfParModification(
name='Carbamidomethyl',
composition='C2H3N1O1',
residues='C',
type='fix',
position='any'
)
modification2 <- msgfParModification(
name='Oxidation',
mass=15.994915,
residues='M',
type='opt',
position='any'
)
modificationlist <- msgfParModificationList(
nMod=2,
modifications=list(
modification1,
modification2
)
)
modificationlist[[3]] <- msgfParModification(
name='Gln->pyro-Glu',
composition='H-3N-1',
residues='Q',
type='opt',
position='N-term'
)
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