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IgL−/− chickens produce antigen specific immunoglobulin. (A, B) 35‐day‐old chickens were immunized with keyhole limpet hemocyanin (KLH) and boosted 7 days after the initial immunization. Levels of antigen‐specific (A) IgM and (B) IgY were analyzed 5 days and 12 days after immunization. Data are shown as mean and SEM of at least four birds per genotype, following the same animals over time.
