Cofactor Requirement of HpyAV Restriction Endonuclease Chan, Siu-Hong ; Opitz, Lars ; Higgins, Lauren ; O'loane, Diana ; Xu, Shuang-yong Abstract Publication: PLoS ONE Pub Date: February 2010 DOI: 10.1371/journal.pone.0009071 Bibcode: 2010PLoSO...5.9071C