https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-67
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-69
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-65
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-64
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-66
https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-68