Catalysis of the reaction: 2 farnesyl diphosphate = diphosphate + presqualene diphosphate.
Source:EC:2.5.1.21
Comment
Note that the two reactions performed by EC:2.5.1.21 are represented in GO by 'farnesyl-diphosphate farnesyltransferase activity ; GO:0004310' and 'squalene synthase activity ; GO:0051996'.
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to farnesyl-diphosphate farnesyltransferase activity (excluding "regulates").
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for farnesyl-diphosphate farnesyltransferase activity (excluding "regulates").