The number of B lymphocytes and T lymphocytes in the blood is an important component of the clinical diagnosis of primary immunodeficiencies. Which disorder would be most likely to lead to low blood counts of T cells and B cells? A. X-linked agammaglobulinemia (XLA)
B. DiGeorge syndrome
C. RAG type SCID
D. X-linked SCID incorrect

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.