Two versions of ctp2-CP4 epsps, expressing two version of the EPSPS enzyme (CP4 EPSPS and CP4 EPSPS L214P)
NK603 is one of Monsanto's maize events sold as "Roundup Ready". It contains two copies of the cp4-epsps gene transfering glyphosate tolerance. The transgenes are controlled by two different promotors, on of which the enhanced CaMV 35S promotor, the other a rice actin promotor. The event was developed by biolistic transformation, i.e. gene gun, using one construct that contained both copies of the herbicide tolerance gene.