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Stem antibodies vary in binding to different H5 HAs. H5 HAs with different sensitivities to stem antibody neutralization were immunoprecipitated by the use of CR6261 (left) and C179 (right) and analyzed by Western blotting with H5 HA1 antiserum. Percentages of the HA1 signal intensities relative to the total input of each HA are indicated below each blot. Input, 1/8 of total sample used for IP; IP, immunoprecipitation; Control, IP negative control with anti HIV gp41 antibody (Chessie 8).
