Transferred to 2.4.2.24

1,4-beta-D-xylan synthase; uridine diphosphoxylose-1,4-beta-xylan xylosyltransferase; 1,4-beta-xylan synthase; xylan synthase; xylan synthetase; UDP-D-xylose:1,4-beta-D-xylan 4-beta-D-xylosyltransferase