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Quaternary structure

In biochemistry, quaternary structure means the arrangement of several proteins to a multiprotein complex. An example are histones that arrange in groups of eight to form a nucleosome.

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Quadratic formula

... of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...