From: Large-scale analysis of post-translational modifications in E. coli under glucose-limiting conditions
N mod(s,a)
N unmod(s,a)
N STA(s,a)
N STA, mod(s,a)
N STA, unmod(s,a)
N EXP(s,a)
N EXP, mod(s,a)
N EXP, unmod(s,a)