label: L-seryl-[EGF-like domain protein] + UDP-alpha-D-xylose => 3-O-(beta-D-xylosyl)-L-seryl-[EGF-like domain protein] + UDP + H(+)
label_lc: l-seryl-[egf-like domain protein] + udp-alpha-d-xylose => 3-o-(beta-d-xylosyl)-l-seryl-[egf-like domain protein] + udp + h(+)