FIG 5. First, 2nd (median), and 3rd quartiles (box) and ±95% (whiskers) of preoperative WBNAA in the 9 patients with low-grade tumors compared with their matched controls (left) and 8 patients with high-grade tumors compared with their matched controls (right). Note preoperative WBNAA was lower in patients with high-grade (8.3 ± 1.8 mmol/L) than in those with low-grade (10.0 ± 2.1 mmol/L) tumors.