RT Journal Article SR Electronic(1) A1 Kharitonenkov, I. G. A1 Siniakov, M. S. A1 Suvorova, Z. K.YR 1980 T1 Influenza Virus Haemagglutinin: Estimation of Tryptophan and Tyrosine Content and Localization of Tryptophan Residues JF Journal of General Virology, VO 50 IS 2 SP 419 OP 422 DO https://doi.org/10.1099/0022-1317-50-2-419 PB Microbiology Society, SN 1465-2099, AB SUMMARY The tryptophan and tyrosine content of the bromelain-released subtype H3 haemagglutinin (H3 BHA) of influenza virus were measured by u.v. absorption and fluorescence techniques. The values obtained (8 and 18 residues, respectively) are in close agreement with those derived from amino acid analysis. Essentially all of the tryptophan residues are demonstrated to be localized on the surface of the BHA molecule., UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-50-2-419