الإتاحة: https://doi.org/10.1073/pnas.1200484109Testhttp://hdl.handle.net/10447/73214Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c85ddfebc4768b0c66f6abcdae9ec190Testhttp://hdl.handle.net/10447/73214Test