Demosponge steroid biomarker 26-methylstigmastane provides evidence for Neoproterozoic animals by Zumberge, J. Alex, Love, Gordon D., Cárdenas, Paco, Sperling, Erik A., Gunasekera, Sunithi, Rohrssen, Megan, Grosjean, Emmanuelle, Grotzinger, John P., Summons, Roger E

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