si_0424 Natural_DNA_Transformation_in_Vibrio Extracellular deoxyribonuclease Dns (EC 3.1.21.-) si_0424 Natural_DNA_Transformation_in_Vibrio Extracellular deoxyribonuclease Xds si_0424 Natural_DNA_Transformation_in_Vibrio Positive regulator of competence TfoX