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Anti-E5.2 and anti-HEL activity of mouse sera. Four BALB/c mice immune sera raised against polyclonal rabbit anti-Id (anti-D1.3) Ab were measured by ELISA for binding to (A) Fab E5.2 (mAb anti-Id, Ab2) and (B) the antigen HEL. Values obtained for the sera of immunized mice are given by: ○, •, □, +; controls from unimmunized animals: x, ⧫.
