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I left my primers on my desk over the weekend. Are they okay to use?

Your primers will be absolutely fine after a weekend on your desk. Dry oligos are stable for several months at room temperature, and oligos resuspended in IDTE will maintain their functional stability for at least a few weeks. See the article in this issue, My Oligos Have Arrived, Now What?, which provides IDT recommendations on oligonucleotide storage and resuspension.