CRISPR/Cas9 Guide by addgene, the nonprofit plasmid repository, Cambridge, Massachusetts, U.S.A.
Links for What is Clustered regularly interspaced short palindromic repeats - CRISPR associated protein 9 (CRISPR-Cas9)?:
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https://www.addgene.org/crispr/guide/
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CRISPR-Cas9: Another Tool for Editing Genomes by Kimball's Biology Pages.
http://www.biology-pages.info/C/CRISPR-Cas9.html -
Introduction to CRISPR and Cas9 by The Registry of Standard Biological Parts, Cambridge, Massachusetts, U.S.A.
http://parts.igem.org/Collections/CRISPR -
The almighty CRISPR-Cas9 technology: How does it work? by The Molecular Ecologist, a forum for readers of Molecular Ecology.
http://www.molecularecologist.com/2016/09/the-almighty-crispr-cas9-technology-how-does-it-work/ -
CRISPR-Cas9 by What is biotechnology? an independent, non-profit educational organisation. Free at the point of access, the website’s activities are supported by the Biotechnology and Medicine Education Trust BIOTECHMET in the United Kingdom.
http://www.whatisbiotechnology.org/science/crispr -
What is CRISPR-Cas9? by yourgenome, everything you want to know about DNA, genes and genomes.
https://www.yourgenome.org/facts/what-is-crispr-cas9