label: N-terminal L-cysteinyl-[protein] + acetyl-CoA => N-terminal N(alpha)-acetyl-L-cysteinyl-[protein] + CoA + H(+)
label_lc: n-terminal l-cysteinyl-[protein] + acetyl-coa => n-terminal n(alpha)-acetyl-l-cysteinyl-[protein] + coa + h(+)