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The amount of the 50-kDa RTF protein correlates with decreased absolute CD4 counts. The amount of the 50-kDa RTF protein was measured from Western blots with monoclonal antibody 2C1 by densitometry to generate the percentage of the 50-kDa protein expressed, and the result was plotted against the absolute CD4 counts. The graph is divided to represent counts of >400 and <400 cells and RTF positive and RTF negative (above and below the horizontal line, respectively).
