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(A) Pair selection with handmade strips. Shown are signals obtained with 0 and 50 ng/ml of recombinant NDM-1 as a function of the pair performance. 1, no specific signal; 2, low specific signal; 3, medium specific signal; 4, high specific signal (U shape); 5, high specific and nonspecific signals. (B) Manufactured cassettes. O, cassette before use; N, negative result; P, positive result.
