27.The statements below for 2,3-bisphosphoglycerate (2,3-BPG) are correct EXCEPT: (A) erythrocytes typically have high levels of 2,3-BPG. (B) 2,3-BPG is synthesized from 1,3-BPG. (C) a kinase converts 2,3-BPG to 3-phosphoglycerate. (D) 2,3-BPG is involved in unloading oxygen from hemoglobin. (E) bisphosphoglycerate mutase is an isomerase.