Fig. 1From: Clinical characteristics and prenatal diagnosis for 22 families in Henan Province of China with X-linked agammaglobulinemia (XLA) related to Bruton’s tyrosine kinase (BTK) gene mutationsHeredity map of the family with the proband. (Each letter (A-O) represents a type of the pedigree. The details can be found in the right-most column of Table 2)Back to article page