{HEAD ~ The Wood Ljungdahl pathway} comprises {TAIL ~ two branches}: the Eastern, or methyl, branch that allows the conversion of CO2 to methyltetrahydrofolate and the Western, or carbonyl, branch that allows the conversion of methyl THF, CO, and Coenzyme A into acetyl CoA  
comprises
{ HEAD ~ The Wood Ljungdahl pathway } comprises { TAIL ~ two branches } : the Eastern , or methyl , branch that allows the conversion of CO2 to methyltetrahydrofolate and the Western , or carbonyl , branch that allows the conversion of methyl THF , CO , and Coenzyme A into acetyl CoA
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