Table 1.

Kinetic Parameters for 125I-CSF Interaction With Eosinophils

125I-CSFK*obs (min−1)No. of Sites†
GM-CSF‡ 2.5 ± 1.2 15 
 0.0061 ± 0.0015 105 
IL-3 0.0071 ± 0.0024 90 
IL-5 0.005 ± 0.002 160 
125I-CSFK*obs (min−1)No. of Sites†
GM-CSF‡ 2.5 ± 1.2 15 
 0.0061 ± 0.0015 105 
IL-3 0.0071 ± 0.0024 90 
IL-5 0.005 ± 0.002 160 

Kinetic parameters determined as described in the Materials and Methods.

*

Apparent association rate.

†

Number of binding sites exhibiting Kobs .

‡

Statistical fit of 1 versus 2 sites (P = .005).

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