label: 3-O-(N-acetyl-alpha-D-glucosaminyl)-L-threonyl-[protein] + UDP + H(+) => L-threonyl-[protein] + UDP-N-acetyl-alpha-D-glucosamine
label_lc: 3-o-(n-acetyl-alpha-d-glucosaminyl)-l-threonyl-[protein] + udp + h(+) => l-threonyl-[protein] + udp-n-acetyl-alpha-d-glucosamine