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Distribution of VEGF-A and its (co-) receptors over the WHO grades. Statistical analysis of (A) expression of VEGF-A, (B) expression of VEGFR-1, (C) expression of VEGFR-2, (D) expression of VEGFR-3, (E) expression of NRP-1, and (F) expression of NRP-2 among human astrocytomas of different WHO grades. (P = .05–.01 → *; P < .01–.001 → **; P < .001 → ***).
