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Serial changes in casein‐specific immunoglobulin isotype formation during the first 6 months of life. Casein‐specific immunoglobulin E (IgE) (A), IgG1 (B), IgG2 (C), IgG3 (D), IgG4 (E), and IgA (F) levels in cord blood (CB) and blood samples obtained at 2, 4, and 6 months of age analyzed by the densely carboxylated protein microarray
