Identification and characterization of proteins of unknown function PUFs) in Clostridium thermocellum DSM 1313 strains as potential genetic engineering targets Authors Suresh Poudel, Alexander L. Cope, Kaela O’Dell, Adam M. Guss, Hyeongmin Seo, Cong T. Trinh, and Robert L. Hettich Journal-Book Biotechnology for Biofuels Year 2021