C57/SV129 WT were irradiated and reconstituted i.v with 5 million bone marrow cells from WT or Spag6KO as previously described40 (link)41 (link). After 6 weeks, mice were footpad and i.p immunized with 10 μg 4-hydroxy-3-nitrophenylacetyl coupled to keyhole limpet hemocyanin at a ratio of 27:1 (Bioresearch Technologies) in 4 mg alum. Mice were bled at day 7 and organs harvested at day 14. NP-specific IgM and IgG1 was determined by ELISA using NP-14–BSA (15 μg/ml; Biosearch Technologies) as previously described42 (link).
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