| CPC C12N 9/22 (2013.01) | 16 Claims |

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1. A Bxb1 integrase comprising:
an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 1; and
one or more amino acid mutations at positions selected from L4I, E42K, R57K, R63K, V76I, H111P, V122M, and V187I, relative to SEQ ID NO: 1.
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