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Southern Blots showing PstI digested DNA from ES cell clone 1A2 after the specific binding of a 3′ radiolabeled probe to the targeting vector (lane 1), DNA from untransfected ES cells (lane 2). Southern blots showing HindIII digested DNA from ES cell clone 1A2 after specific binding of a 5′ radiolabeled probe to the targeting vector (lane 3) , and DNA from untransfected ES cells (lane 4).
