Maybe it is the fact that one amino acid is coded by three DNA bases.
Furthermore, DNA code is degenerated (more than one DNA base triplet
corresponds to one amino acid).
Hope this help...
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Dimitri Gilis
Unite de Conformation des Macromolecules Biologiques
ULB (Belgium)
tel: +32 2 648 52 00
fax: +32 2 648 89 54
e-mail : dimitri at ucmb.ulb.ac.be
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