Patent ID: 9234194
Filing Date: 2016-01-12
CPC Classification: C12N,C40B

Claim Text:
1. A composition comprising: (a) a first DNA library comprising a first population of plasmids wherein each plasmid in the first population comprises a first selectable marker; and each plasmid in the first population comprises a member of a population of modified FRT recombination sites, wherein each member of the population of modified FRT recombination sites is at least 80% identical to SEQ ID NO:39, wherein each member of the population of modified FRT recombination sites comprises a spacer region comprising at least one nucleotide alteration in SEQ ID NO:43, wherein the first population of plasmids comprises at least about 100 distinct members and wherein the modified FRT recombination sites in the at least 100 distinct members of the first plasmid population comprise functional modified FRT recombination sites that are recognized by a FLP recombinase and capable of a recombinase mediated recombination reaction; and, (b) a second DNA library comprising a second population of plasmids wherein each plasmid in the second population comprises a second selectable marker, wherein the second selectable marker is distinct from the first selectable marker; and each plasmid in the second population comprises a member of the population of modified FRT recombination sites, wherein each member of the population of modified FRT recombination sites is at least 80% identical to SEQ ID NO:39, wherein the second population of plasmids comprises at least about 100 distinct members, and wherein the at least 100 distinct members of the second plasmid population comprises a functional modified FRT recombination site that is recognized by a FLP recombinase and capable of a recombinase mediated recombination reaction.