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cytosine guanine necklace gold vermeil Chain_Upsell Seven alpha helices traverse the The result is a Seven alpha helices traverse the cell membrane The golden ratio φ = (1+√5) 2 ≈ 1 It is also why CpG islands (GC rich regions) behave differently from surrounding DNA and why methylation at these sites has such potent regulatory effects The cytosine guanine pair bonds via three hydrogen bridges (adenine thymine has only two)
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