PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 20930330-1 2010 The balance between extracellular inorganic phosphate (ePi) and extracellular inorganic pyrophosphate (ePPi) is controlled by four membrane proteins: the transporters ANK (exporting PPi outside the cells) and PiT-1 (importing ePi into the cells), and the enzymes PC-1 (generating ePPi from nucleotides) and Tissue Non-specific Alkaline Phosphatase (TNAP, hydrolyzing ePPi into ePi). eppi 103-107 POU class 1 homeobox 1 Homo sapiens 209-214