“…Contradictory results were already observed in previous studies using L‐arginine or other NO increasing drugs (e.g., NO donor) in different animal models of anxiety, and both anxiolytic‐like (e.g., Kalouda & Pitsikas, ; Spiacci, Kanamaru, Guimarães, & Oliveira, ) and anxiogenic‐like effects were found (e.g., Umathe et al, ). However, despite these contradictory results of L‐arginine in animal models of anxiety, L‐arginine challenge had been successfully used to detect a nitrergic mediation of anxiolytic‐like effect of treatments in different conditions (e.g., Bonassoli, Contardi, Milani, & De Oliveira, ; Siba et al, ), including marble‐burying behavior (Gawali et al, ; Krass et al, ; Umathe et al, ). Thus, for the first time, the present results indicated an important role of NO transmission on anxiolytic‐like effect of C. sinensis essential oil.…”