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Northern-blot analysis of BY2 mRNA. Two micrograms of BY2 poly(A+) RNA was loaded for each lane. The blot was probed with a probe made to the full-length NTEXP1 cDNA. The numbers above the lanes indicate the ages of the cells in days. The numbers on the right indicate the sizes of the RNAs in kilobases. Northern-blot analysis was repeated on at least five separate occasions with similar results.
