Tetramerium, a genus of plants belonging to the family Acanthaceae
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The different sub-units may have each their own activity, such as binding biotin in avidin tetramers, or have a common biological property, such as the allosteric binding of oxygen in hemoglobin.
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"Tetramethylplatinum" was claimed in 1952 by Henry Gilman as a derivative of this tetramer, but this claim was later shown to be incorrect ("Tetramethylplatinum" proved to be PtMe3OH4).
Class I RNR enzymes are constructed from large RNR1 and small RNR2 subunits which associate to form an active heterodimeric tetramer.