Product Introduction M13KO7 Helper Phage is used in conjunction with the phagemid of choice. In the presence of a phagemid bearing a wild-type M13 or f1 origin, single-stranded phagemid DNA is packaged preferentially and secreted into the culture medium. This allows easy production of single-stranded phagemid DNA. Bioz Badge Exists : True Catalog # Size Concentration N0315S 1.8 ml 1 x 10<sup>11</sup> pfu/ml