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. 2015 Dec 23;6:1170. doi: 10.3389/fpls.2015.01170

FIGURE 5.

FIGURE 5

Detection of specific neutralizing immunoglobulin Y (IgY) antibodies against BLSVP8d after immunization of hens with either fresh or lyophilized transplastomic soluble protein extracts. (A) Detection of specific IgY antibodies in egg yolk obtained from hens immunized with total soluble protein extracts. Titers are indicated both for fresh (dark bars) and lyophilized (light bars) samples. Animals received three doses containing 3.83 μg of BLSVP8d (2 μg corresponded to VP8d). As a control, groups of hens were also immunized with total soluble protein extracts obtained from fresh and lyophilized wild-type leaves. Purified IgY response was evaluated by ELISA. Titers were expressed as the reciprocal of the highest IgY dilution which gave an OD value above the mean values of the respective control samples plus 3 standard deviations. (B) Viral neutralization assay to assess the prevention of bovine rotavirus infection in vitro conferred by specific IgY antibodies. Titers were expressed by the Reed and Muench’s (1938) method considering the highest dilution that resulted in an 80% reduction of fluorescent foci. Titers are indicated both for fresh (dark bars) and lyophilized (light bars) samples. An IgY fraction obtained by immunization of a hen with BLSVP8d previously produced in E. coli was included as control (white bar).