FIG. 4.
IgG1-specific antibody response in sera of volunteers as shown in Fig. 2 measured by ELISA with 1:100 diluted mouse human IgG1 as described in Materials and Methods. Key: □, day 0; ▨, day 14; 
, day 42; 
, day 70; 
, day 240; 
, day 254.
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