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CD19+ cell counts of patients with B+ and B− genotypes. B+ genotypes group consisted of CD19+ cell counts of patients with mutations found in IL2RG (n = 43), IL7R (n = 3), and JAK3 (n = 5). B− genotypes group consisted of CD19+ cell counts of patients with mutations found in ADA (n = 1), DCLRE1C (n = 3), RAG1 (n = 3), and RAG2 (n = 2). The cutoff for distinguishing B+ and B− patients was 134 CD19+ cells/μL. Three patients with IL2RG mutations were classified as having B− SCID.
