469 . Methods Mol Biol. 2007;379:51-68. doi: 10.1007/978-1-59745-393-6_4. Methods Mol Biol. 2007. PMID: 17502670 Free PMC article. . Bentham R, et al. Nature. 2021 Sep;597(7877):555-560. doi: 10.1038/s41586-021-03894-5. Epub 2021 Sep 8. Nature. 2021. PMID: 34497419 .