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Common structures of archaeal lipids: (A) saturated archaeol (B) hexa-unsaturated archaeol. Both structures could be linked to polar head group to give AA (archaetidic acid), AG (archaetidylglycerol), AGS (archaetidylglycerosulfate), AGP (archaetidylglycerophosphate), AGP-Me (archaetidylglycerophosphte methyl ester), and TGA (triglycosyl archaeol).
