{HEAD ~ The nucleic acid molecule} 19, wherein said vector comprises at least one of an origin of replication, a ribosomal binding site, a nucleic acid sequence encoding a drug resistance enzyme, and nucleic acid sequences encoding {TAIL ~ secretion signals}, periplasm or peroxisome localization signals, or signals useful for polypeptide purification 
{ HEAD ~ The nucleic acid molecule } 19 , wherein said vector comprises at least one of an origin of replication , a ribosomal binding site , a nucleic acid sequence encoding a drug resistance enzyme , and nucleic acid sequences encoding { TAIL ~ secretion signals } , periplasm or peroxisome localization signals , or signals useful for polypeptide purification
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