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        <title>Structure of Xenopus laevis CR subunit</title>
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            <author>Shi Y</author>
            <author>Huang G</author>
            <author>Yan C</author>
            <author>Zhang Y</author>
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                    <author order="4">Zhu X</author>
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                    <title>Structure of Xenopus laevis Cytoplasmic Ring.</title>
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