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Serum hemagglutination (HAI) titers after immunization of mice with split X-31 influenza adjuvanted with PCPP derivatives (5 μg antigen, 30 μg polymer doses; geometric mean titers of 5 BALB/C mice; *statistically significantly different from PCPP, P = 0.0121; **statistically significantly different from PCPP, P = 0.0733; compiled from data published in [36]).
