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Serum neutralizing titers (NT50) in (A) epithelial (ARPE-19) and (B) fibroblast (MRC-5) cells vs ELISA titers (AD-2 peptides 5, 6, and 7) from the epidemiological study. Correlations were highly significant (p ≤ 0.01), but most of the variability in neutralization is not predicted by AD-2 peptide ELISA (R2 = 0.06, 0.07).
