Fig. 2From: A markerless gene deletion and integration system for Thermoanaerobacter ethanolicus Design of homologous recombination fragments (a) recombination events for deleting tdk in wild-type strain (b) recombination events for deleting ldh in X20 (c) and recombination events for inserting tdk into X20 (d) P promoter; up upstream; down downstream; int internalBack to article page