Browsing FAS Scholarly Articles by Keyword "choanoflagellates"
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Sterols in a Unicellular Relative of the Metazoans
(National Academy of Sciences, 2008)Molecular clocks suggest that animals originated well before they first appear as macroscopic fossils, but geologic tests of these hypotheses have been elusive. A rare steroid hydrocarbon, 24-isopropylcholestane, has been ...