Primase is required for helicase activity and helicase alters the specificity of primase in the enteropathogen Clostridium difficile oleh Erika van Eijk, Vasileios Paschalis, Matthew Green, Annemieke H. Friggen, Marilynn A. Larson, Keith Spriggs, Geoffrey S. Briggs, Panos Soultanas, Wiep Klaas Smits