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...|date=2008|title=Some nonlinear challenges in biology|journal=Nonlinearity|language=en|volume=21|issue=8|page=T131|doi=10.1088/0951-7715/21/8/T03|issn=0951-771 ...9}}</ref> Small molecules such as sugars, amino acids, and nucleotides can act as single repeating units called [[monomer]]s to form chain-like molecules ...