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Table 2

Serum Levels of IL-4 at Various Times after Transfer of T Cell Hybrids Transduced to Express IL-4

Serum IL-4 levels
Day 6Day 13Day 24
  pg/ml 
Mouse 1  n.d.  n.d.  1.26 
Mouse 2  n.d.  n.d.  1.19 
Mouse 3  n.d.  n.d.  2.11 
Mouse 4  n.d.  n.d.  2.53 
Serum IL-4 levels
Day 6Day 13Day 24
  pg/ml 
Mouse 1  n.d.  n.d.  1.26 
Mouse 2  n.d.  n.d.  1.19 
Mouse 3  n.d.  n.d.  2.11 
Mouse 4  n.d.  n.d.  2.53 

N5-transferred mice were bled from the tail vein on the indicated days into heparinized tubes. Serum was obtained by centrifugation and tested for IL-4 by ELISA as described in Materials and Methods. n.d., none detected (lower limit of detection of ELISA = 0.875 pg/ml).  

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