Figure 1From: Relevance of laboratory testing for the diagnosis of primary immunodeficiencies: a review of case-based examples of selected immunodeficienciesEvaluation for X-linked agammaglobulinemia (XLA). A) Flow cytometric evaluation for Btk protein in a healthy control. B) Flow cytometric evaluation for Btk protein in Case 1 patient. C) Full-gene sequencing in the BTK gene for mutation analysis in Case 1 patient. D) Schematic representation of Btk protein structural organization. E) Schematic representation of Btk in B cell development.Back to article page