DHH and neurofibroma: (D) Neurofibroma diameter quantification at 7 months (unpaired t-test ***p = 0.0004) (for C and D: Nf1fl/fl;Dhh+ n = 8 mice, 48 neurofibroma tumors; P2ry14-/-;Nf1fl/fl;Dhh+ n = 8 mice, 11 neurofibroma tumors).