Restriction maps of pUX5-S22 and pUX5-N. The open bars represent cloned DNA fragments in the pUC119 vector, and the solid parts correspond to the xyn5 gene in pUX5-S22 and a 5′ part of the xyn5 gene in pUX5-N. The transcriptional direction of xyn5 is shown beneath the restriction maps. S, SacI; E, EcoRI; H, HindIII; K, KpnI.