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Antibody titers of GPS treated groups and control groups. Superscripts with different letters (a–d) differ significantly (P < 0.05). Group 4 = 100 mg/kg GPS + vaccine. Group 5 = 200 mg/kg GPS + vaccine. Group 6 = 400 mg/kg GPS + vaccine. Group 7 = vaccine only. Group 8 = no vaccine, no GPS (blank control).
