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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase DNA structure

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helical-staircase Spiral staircase seen from below

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