GAPDH and esophageal squamous cell carcinoma: Four independent EMX2-transfected ESCC clones (EMX2-KYSE170-1, EMX2/GAPDH = 6557; EMX2-KYSE170-2, EMX2/GAPDH = 9574; EMX2-KYSE170-3, EMX2/GAPDH = 4879; EMX2-KYSE510, EMX2/GAPDH = 28659) were derived from two originally EMX2-absent ESCC cell lines.