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Representative images from prospective slide storage tissue microarray (TMA) study. Slides stored at room temperature for the indicated times are shown on the left, and slides stored at –20°C for indicated times are shown on the right. TMA spots are from adjacent slides, so histology is highly similar. Note very little difference at 1 month but a marked increase in signals in TMA spots stored at –20°C for 2 years. (×200)
