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Nucleic acid design can be used to create nucleic acid complexes with complicated secondary structures such as this four-arm junction.
There are 20 common amino acids found in proteins, each with a different R group (variant group) that determines its chemical nature.
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Hydrogen bonding in the A·T and C·G Watson-Crick DNA base
Schematic drawing of mechanism participating in DA transmission. AADC: aromatic amino acid decarboxylase;