WT and DKO mice were intrapenitoneally injected with 100-200 µg of NP-CGG emulsified in complete Freund’s adjuvant (Sigma-Aldrich). The spleens from day 14 and 20 immunized WT and DKO mice were frozen, and the crystal sections were stained with the indicated antibodies. Sera were diluted and analyzed by ELISA using microplates coated with NP30 or NP11-BSA (4-Hydroxy-3- nitrophenylacetyl hapten conjugated to Bovine Serum Albumin) and NP-specific Ig isotypes using Clonotyping System (Southern Biotechnology Association).
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