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Investor Presentaiton

Platform now includes both viral and bacterial protein targets Robust preclinical antibodies titers across many target antigens (viral & bacterial) Viral Bacterial Neutralizing titer (log2) ** RSV rProt mRNA Neutralizing titer (log2) Source: Data on file. rProt = recombinant Protein 81 Vaccines Investor Event hMPV :: rProt mRNA Neutralizing titer (log2) 215- PIV3 OPK titers 107 106 Acne 1 Seroneutralization titers 100 10- 10³ rProt mRNA rProt mRNA Negative control rProt Acne 2 mRNA Negative control ELISA titer (log10EU) Chlamydia rProt mRNA Negative control sanofi

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