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… tool to correlate protein annotations with ratios of DNA sequence fragments from the ecosystems. Selecting a protein … Those similarities, based on their ratios of small DNA sequence fragments called tetranucleotides, are a way to …

… Cas9 needs guide RNA to lead it to the correct sequence to snip — but not all guides are effective. To … approach: CRISPR-Cas9 relies on RNA with a short guiding sequence (20 bp) that directs the endonuclease where to cut, … , the scientists thus set out to identify which sgRNA sequences were reliable. In an elegant, quantitative screen, …