mod,57,C,fixed	#CAM
mod,-17,CQ,nterminal	#pyroglutamate, Pyro-cmC
mod,57,*,nterminal	#CAM
mod,12,*,nterminal	#chemical adduct
mod,43,*,nterminal	#carbamylation
mod,16,MW	#oxidation
mod,-48,M	#neutral loss on Met or oxM