What is a proper Markush group in patent claims?

What is a proper Markush group in patent claims? A proper Markush group in patent claims is a closed group of alternatives. According to MPEP 2117, “A Markush claim contains an ‘improper Markush grouping’ if either: (1) the members of the Markush group do not share a ‘single structural similarity’ or (2) the members do…

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