F2RL1 and gastroesophageal reflux disease: Division of GERD patients into non-erosive and erosive types of GERD revealed that the expression of F2RL1 was non-significantly different in ERD compared to NERD as well as healthy controls (326.10 ± 112.30 vs. 266.90 ± 84.76 vs. 77.60 ± 28.50, Figure 2A).