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I need to reorder a previously existing product, such as M-xxxxxx-00. Has it been redesigned?

Check the website to find the current catalog number - the first 2-digit number will indicate the version. If its different than what you ordered, then it has been versioned. You may contact Technical Support (Ts. dharmacon@horizondiscovery. com) for details on how this product has changed. Any sequences no longer available in the pre-designed catalog are available through custom synthesis.