Crossed radioimmunoelectrophoresis (CRIE) of cat allergen extract

(Panel A) Crossed immunoelectrophoresis (CIE) showing blue-stained, bell-shaped antigen-antibody precipitates. Each precipitate represents one antigen.

(Panels B and C) Crossed radioimmunoelectrophoresis (CRIE) showing radiograph chromatograms of radio-staining of immunoglobulin E (IgE) from individual patients. Each stained precipitate represents reactivity with an allergen that can be identified by comparison with panel A.