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The medium-chain-length polyhydroxyalkanoate (PHAMCL) synthase genes phaC1 and phaC2 of Pseudomonas mendocina NK-01 were cloned into expression plasmid pBBR1MCS-2 to form pBBR1MCS-C1 and pBBR1MCS-C2 which were expressed respectively in the PHAMCL-negative strain Pseudomonas mendocina C7 whose PHAMCL synthesis operon was defined knock out.