Other ways to make unsaturated fatty acids

Other ways to make unsaturated fatty acids 

The fabA gene encodes the dehydratase or isomerase specifically required for the production of unsaturated fatty acids in gram-negative bacteria. Gram-positive bacteria do not contain an identifiable fabA homolog in their genome, but do possess unsaturated fatty acids. In Bacillus, it has been shown that a cold shock-induced gene (desA) encodes a desaturase 

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