The list of the latest additions since the beginning of September is impressive. They are called CasMINI (see Molecular Cell), Cas7-11 (see Nature), OMEGAs (see Science), and come respectively from Stanford University (Stanley Qi Lab), MIT (McGovern Institute), and the Broad Institute (Zhang Lab). CasMINI is half the size of Cas9 and could be much easier to deliver. Cas7-11 is the Cas9 of RNA. OMEGAs are a new class of widespread RNA-guided enzymes, thought to be the ancestors of CRISPR.
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Time will tell if it is going to become the preferred enzyme for genome editing or just another useful tool in the expanding CRISPR kit. But the future of CasX looks bright. It is much smaller than the nucleases that have provided a foundation for this technology. Being fewer than a thousand amino acids, it offers clear advantages for delivery in comparison with Cas9, that is over 1,300 Aa. 
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It is Science but it could be mistaken for The CRISPR Journal. The latest issue indeed runs three papers by three CRISPR aces – David Liu, Jennifer Doudna, and Feng Zhang – about the cutting-edge fields of 