Growth (A), volumetric (B) and specific (C) cephamycin C production of S. clavuligerus NRRL 3585 (open circles), TB3585 (open squares), TBV (open triangles), AK39 (closed circles), BA39 (closed squares), BAV (closed triangles) grown in defined mCDM medium. The experiment was performed in duplicate flasks and triplicate samples were analyzed from each flask.