https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-43 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-45 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-47 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-51 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-49 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-42 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-44 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-46 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-50 https://bmcstructbiol.biomedcentral.com/articles/10.1186/1472-6807-9-48