The "split-white landing site" plasmid p3xP3-RFP.wEx3-6.attP.attB contains the Disc\RFP3xP3.PB marker, followed by a P1\loxP site, followed by wEx3-6 in reverse orientation, followed by a phiC31\attP site then a Sliv\attB site and is designed to be a donor for a phiC31-based integration system.
As this construct contains both Sliv\attB and phiC31\attP sites, it is possible for intermolecular recombination to occur between plasmids carrying the construct.
The "split-white landing site" plasmid p3xP3-RFP.wEx3-6.attP.attB contains the Disc\RFP3xP3.PB marker, followed by a P1\loxP site, followed by wEx3-6 in reverse orientation, followed by a phiC31\attP site then a Sliv\attB site and is designed to be a donor for a phiC31-based integration system.
As this construct contains both Sliv\attB and phiC31\attP sites, it is possible for intermolecular recombination to occur between plasmids carrying the construct.