In contrast, with bone marrow significant reductions in anti-DNP responsiveness was shown with concentra- tions as low as 0 .4 ug DNP,-HGG/ml (2.5 x 10 -9 M), and marginal reduction may even have been present at 0.04 ug antigen/ml (2 .5 x 10 -1 M) though this did not reach statistical significance .
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