Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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G (guanine)
G (guanine): G stands for guanine, one member of the
base pair G-C (guanine-cytosine) in DNA. The other base pair in DNA
is A-T (adenine-thymine).