Abstract
The immunological specificity of two anti-IgM fluorescein-labelled antisera was evaluated in gel diffusion, by the direct immunofluorescent technique on characterized bone marrow preparations taken from patients with myeloma and by an indirect staining method employing virus-infected cells and selected post-infection sera. The results show that neither gel diffusion nor direct immunofluorescent methods provide a reliable index of specificity for conjugates to be used in indirect procedures.
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