How many genes are required for the synthesis of chlortetracycline?
D000873:Anthracenes / Q000096:biosynthesis / Q000378:metabolism; D055598:Chemical Phenomena; D002621:Chemistry; D002751:Chlortetracycline / Q000096:biosynthesis*; D003065:Coenzyme A / Q000096:biosynthesis / Q000378:metabolism; D003653:Decarboxylation; D005796:Genes; D005827:Genetics, Microbial; D005947:Glucose / Q000378:metabolism; D013302:Streptomyces / Q000378:metabolism*
D000873:Anthracenes; D005947:Glucose; D003065:Coenzyme A; D002751:Chlortetracycline