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Sterol biosynthesis in Arabidopsis. The pathway to sterols and BRs is shown from the first cyclic precursor, cycloartenol. Sterol molecules are labeled with their common names. Enzymes involved are underlined and genes identified by mutants are shown in italics. The sterol C-14 reductase step is boxed. The BR-specific pathway from campesterol to BRs is shown in a large box.
