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Figure 2. Observation site for histomorphometry. (A) Cross-sections were obtained at the level of 500–600 µm from the furcation of the disto-palatal root of the maxillary first molars. (B) The cell number and total area of NOS-immunoreactivity were recorded at a 200 x 200 µm2 square in the center of the distal periodontal area. 
= Mesiodistal line that passed through the central point of the root. P = The intersection of the -line and the borderline between the distal PDL and alveolar bone. ß = The line that passed through point P and perpendicular to the -line. M, mesial; D, distal; Bu, buccal; L, lingual; PDL, periodontal ligament; R, root.
