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The hydrophilic form of NAD(P)H:(quinone acceptor) oxidoreductase (EC 1.6.99.2) from mouse liver cytosol has been crystallized in the presence of FAD. X-ray diffraction analysis showed these crystals to be tetragonal and to belong to the I422 space group. The unit cell measured a = b = 246.5 A and c = 70.4 A. Since the subunit molecular weight is 30,000, the asymmetric unit probably contains two pairs of dimers.
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Amzel et al. (1986) studied this question.
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