label: (glycyl)(n)-glycyl-L-glutamyl-[protein] + glycine + ATP => (glycyl)(n+1)-glycyl-L-glutamyl-[protein] + ADP + phosphate + H(+)
label_lc: (glycyl)(n)-glycyl-l-glutamyl-[protein] + glycine + atp => (glycyl)(n+1)-glycyl-l-glutamyl-[protein] + adp + phosphate + h(+)