tokens: The actA gene is present as a single copy in the genome of A. chrysogenum ; and its expression level , opposite to pcbC and cefEF cephalosporin biosynthetic genes , was steady during cephalosporin fermentation , showing a single 1.4-kb transcript .
folded_tokens: the acta gene be present as a single copy in the genome of a. chrysogenum ; and its expression level , opposite to pcbc and cefef cephalosporin biosynthetic gene , be steady during cephalosporin fermentation , show a single 1.4-kb transcript .