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In the Laboratory Procedures communication titled "Haptoglobin Electrophoresis," published Oct 7 (206:362-363), two labels for the Figure —those for "patient's serum" and "Hp control"—were mistakenly transposed. The corrected illustration and the legend appear below.
Mislabelled Agar-Gel Plate. JAMA. 1969;207(1):108. doi:10.1001/jama.1969.03150140060008