#nucleotide  a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
  supertype:  ester  formed by reaction between an acid and an alcohol with elimination of water
  subtype:  adenosine_monophosphate__adenosinemonophosphate__AMP__adenylic_acid  a nucleotide found in muscle cells and important in metabolism; reversibly convertible to ADP and ATP
  subtype:  adenosine_diphosphate__adenosinediphosphate__ADP  an ester of adenosine that is converted to ATP for energy storage
  subtype:  adenosine_triphosphate__adenosinetriphosphate__ATP  a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular reactions
  subtype:  muton  the smallest unit of DNA where a mutation can occur

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