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    GE unit to be based in Marlborough

    GE Healthcare, which last week said it would open a US headquarters in Massachusetts for its life sciences business, is set to disclose Wednesday that the business will be based in Marlborough, where the company expects to add about 220 jobs.

    The life sciences unit, called GE Healthcare Life Sciences, sells bioreactors, diagnostic tools, and other equipment used in biotechnology manufacturing globally. It has operated at two New Jersey sites, in Piscataway and Princeton, but last week notified New Jersey state officials that it plans to eliminate 218 positions at the Piscataway location.

    GE Healthcare, the parent division based outside London, has about $4 billion in annual sales and more than 11,500 employees in over 100 countries. It currently employs about 250 people in Marlborough at the former site of Xcellerex Inc., a medical technology company GE acquired in 2012, and at a bioprocessing and diagnostics operation in Westborough.

    Robert Weisman

    Robert Weisman can be reached at Follow him on Twitter @GlobeRobW.