FIG. 3.

Comparison of two methods for blocking of C PS antibodies. Reference serum 89SF was used against type 19F PS without C PS absorption (solid line), preadsorbed with 50 μg of Danish C PS per ml (dotted line), without preabsorption but with 1 μg of C PS per ml added to the serum dilution buffer (dashed line), or both with preadsorption and with C PS added to the serum dilution buffer (dashed and dotted line).