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NEUTRALIZATION ESCAPE MUTANTS OF TYPE-A INFLUENZA-VIRUS ARE READILY SELECTED BY ANTISERA FROM MICE IMMUNIZED WITH WHOLE VIRUS - A POSSIBLE MECHANISM FOR ANTIGENIC DRIFT
JOURNAL OF GENERAL VIROLOGY.  v. 75. no. Part 12.   1994-12. p. 3493 - 3502... issn: 0022-1317 .   

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