The invention additionally provides a method for producing acetyl CoA, for example, by culturing an acetyl CoA producing microbial organism, where the microbial organism expresses at least one exogenous nucleic acid encoding an acetyl CoA pathway enzyme or protein in a sufficient amount to produce {TAIL ~ acetyl CoA}, under conditions and for a sufficient period of time to produce {HEAD ~ acetyl} CoA 
The invention additionally provides a method for producing acetyl CoA , for example , by culturing an acetyl CoA producing microbial organism , where the microbial organism expresses at least one exogenous nucleic acid encoding an acetyl CoA pathway enzyme or protein in a sufficient amount to produce { TAIL ~ acetyl CoA } , under conditions and for a sufficient period of time to produce { HEAD ~ acetyl } CoA
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