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Heterocyst glycolipids (HGs) are biomarkers for heterocystous N2-fixing cyanobacteria and consist of a sugar moiety bound to an even numbered C26–C32 alkyl chain, containing various alcohol or ketone groups. They have been reported in ancient sediments but, due to a lack of standards, they were quantified in terms of integrated peak area response. Here we describe the use of a commercially available...
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