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Endoplasmic Reticulum acetyl-CoA C- acetyltransferase Hydroxymethylglutaryl- CoA synthase 3-hydroxy-3- methylglutaryl- coenzyme A reductase 2 mevalonate kinase Phosphomevalonate kinase Diphosphomevalonate decarboxylase Isopentenyl- diphosphate Delta-isomerase Farnesyl pyrophosphate synthase Farnesyl pyrophosphate synthase Squalene synthase squalene monooxygenase Lanosterol synthase Lanosterol 14-alpha demethylase Delta(14)- sterol reductase Methylsterol monooxygenase Methylsterol monooxygenase Methylsterol monooxygenase C-3 sterol dehydrogenase 3-keto sterol reductase Methylsterol monooxygenase Methylsterol monooxygenase Methylsterol monooxygenase C-3 sterol dehydrogenase 3-keto sterol reductase Sterol 24-C- methyltransferase C-8 sterol isomerase C-5 sterol desaturase C-22 sterol desaturase C-24 sterol reductase C-8 sterol isomerase C-5 sterol desaturase Acetyl-CoA CoA Acetoacetyl-CoA Acetyl-CoA H 2 O 3-Hydroxy-3- methylglutaryl- CoA CoA NADPH Mevalonic acid NADP CoA ATP Mevalonic acid-5P ADP ATP ADP (S)-5- Diphosphomevalonic acid ATP ADP P i Isopentenyl pyrophosphate CO 2 Dimethylallylpyrophosphate Isopentenyl pyrophosphate PP i Geranyl-PP Isopentenyl pyrophosphate Farnesyl pyrophosphate PP i NADPH Squalene NADP PP i O 2 NADPH (S)-2,3- Epoxysqualene H 2 O NADP Lanosterin O 2 NADPH 4,4- Dimethylcholesta- 8,14,24- trienol Formic acid NADP H 2 O NADPH 4,4-Dimethyl- 5a-cholesta- 8,24-dien-3- b-ol NADP H + O 2 NADPH 4α- hydroxymethyl- 4β-methyl-5α- cholesta- 8,24-dien-3β- ol NADP H 2 O H + O 2 NADPH 4α-formyl-4β- methyl-5α- cholesta- 8,24-dien-3β- ol H 2 O NADP O 2 NADPH 4β-methyl-4α- carboxy- cholesta- 8,24-dien-3β- ol H 2 O NADP NADP 3-Keto-4- methylzymosterol CO 2 NADPH NADPH H + NADP 4a- Methylzymosterol H + O 2 NADPH H 2 O NADP 4α- hydroxymethyl- 5α-cholesta- 8,24-dien-3β- ol H + O 2 NADPH 4α-formyl-5α- cholesta- 8,24-dien-3β- ol H 2 O NADP O 2 NADPH 4α-carboxy- 5α-cholesta- 8,24-dien-3β- ol H 2 O NADP NADP 5α-cholesta- 8,24-dien-3- one CO 2 NADPH NADPH H + Zymosterol NADP S- Adenosylmethionine fecosterol S- Adenosylhomocysteine H + Episterol H + O 2 ferrocytochrome c 5,7,24(28)- Ergostatrienol H 2 O ferricytochrome c H + NADPH O 2 ergosta- 5,7,22,24(28)- tetraen-3-β- ol NADP H 2 O H + NADPH Ergosterol NADP 5a-cholesta- 7,24-dien-3B- ol 7- Dehydrodesmosterol Desmosterol Cholesterol Tetradecanoyl- CoA CE(14:0) CoA