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 TSB medium. The experiment was performed in duplicate flasks and triplicate samples were assayed from each flask.