Abstract
The 16S ribosomal DNA based distinction between
the bacterial and archaeal domains of life is strongly
supported by the membrane lipid composition of
the two domains; Bacteria generally contain dialkyl
glycerol diester lipids, whereas Archaea produce
isoprenoid dialkyl glycerol diether and membranespanning
glycerol dialkyl glycerol tetraether (GDGT)
lipids. Here we show that a new group of ecologically
abundant
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