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Sequence of three patients (labeled 1, 2, and 3) diagnostic leukemic DNA (unshaded upper) and the (identical) MLL-AF4 or AF4-MLL fusion sequence from Guthrie DNA (shaded lower). Patient-specific oligonucleotide primers were derived from underlined sequence. (▾), MLL-AF4 or AF4-MLL breakpoint fusion for each patient.
