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HMA genotyping of 5′-UTR products with a modified reference panel containing only subtypes 1a and 3a, showing typical heteroduplex patterns. Isolates can be classified into the following groups: A, 1; B, 2b or 6; C, 3a; and D, 2a/c, 3b, or 4. The reference panel used is shown along the bottom, and the test sample is indicated on the left. Lane M, molecular size markers.
