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Hepatitis Research Unit Department of Microbiology London School of Hygiene & Tropical Medicine, London, WC1E 7HT
Hepatitis B (Australia) antigen was isolated from normal serum proteins by gel filtration and electrofocusing. The latter technique revealed a heterogeneity of the small spherical particles associated with hepatitis B antigen activity, there being a variance in determined isoelectric points according to the serological subtype studied. Hepatitis Bantigen isolated in this manner was aggregated by concanavalin A.
Received 16 November 1972;
accepted 3 May 1973.
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