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Profiles of OVA-specific IgG antibody subclasses in mice intraperitoneally immunized with OVA-containing SucPG-liposomes. Mice were immunized intraperitoneally with OVA alone (group I) or polymer-(SucPG-) unmodified liposomes entrapping OVA (group II) or SucPG-modified liposomes entrapping OVA (group III), and serum antibody titers were measured by ELISA on day 7 following secondary immunization. Results are expressed as the mean ± SEM in 5 different mice.
