https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-76
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-73
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-75
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-72
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-74