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Nelson (shoulder) will throw a bullpen session Saturday, Nick Piecoro of The Arizona Republic reports.

Nelson has been on the injured list since last Saturday due to shoulder inflammation. The fact he's been cleared to return to a mound after just a week on the IL bodes well for his chances of being activated after a minimum-length stay, but he still has a few more boxes to check before the D-backs can pencil him back into their rotation.

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