WT or Esrrg-cKO mice, 2–3 months old, were immunized with 100 μg NP23-KLH in alum (1:1) at week 0 and boosted at week 2. Serum samples were collected at weeks –1, 1, and 3. Serum NP-specific IgG1 were determined as previously described (13 (link)) by ELISA using plates coated with NP4-BSA or NP25-BSA (Biosearch Technologies), followed by incubation with 1:500 diluted serum samples and developed with alkaline phosphatase–conjugated goat anti-mouse IgG1. All samples were run in duplicate.
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