| CPC C12N 15/79 (2013.01) [C12N 9/12 (2013.01); C12N 2750/14143 (2013.01); C12Y 207/11025 (2013.01)] | 16 Claims |

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1. An inhibitor, comprising a protein comprising a leucine zipper domain that shares at least 95% identity to SEQ ID NO: 1, wherein the leucine zipper domain comprises at least one substitution at one or more of the positions 391 and 393.
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