Expression of inducible nitric oxide synthase, nitrotyrosine, eosinophilic peroxidase, eotaxin-3, and galectin-3 in patients with gastroesophageal reflux disease, eosinophilic esophagitis, and in healthy controls: a semiquantitative image analysis of 3,3′-diaminobenzidine-stained esophageal biopsies. This evidence concerns the gene NOS2 and eosinophilic esophagitis.