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                 Another highly commercialized way of producing biofuels is to recycle animal oil, which is cheap but
                 <b>rather than pure</b> .
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                 Recent years have witnessed the advancement of another source for biofuel production, namely <b>Microbes</b> . 
                 Microbes represented by microalgae, yeast and mold are excellent resources for <b>producing lipid</b> .<br> Using microbes to produce biofuels can demonstrate significant <b> advantages</b>, namely high productivity, little room requirement, and no natural environment limitation.  
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