Analysis of molecular fossils sheds light on how sterol pathways evolved.
The biosynthetic pathways that give rise to molecules called sterols are well established in the scientific literature. These pathways include the modifications of a molecule called squalene to form lanosterol and cycloartenol, which are protosterols — precursors of other sterols.
Numerous other steps are then needed to make cholesterol and other related sterols that are found in organisms with cells that have a nucleus ; organisms called crown eukaryotes are either living eukaryotic species or extinct eukaryotic species that are descended from the last common ancestor of all living eukaryotes.
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