PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23866594-1 2013 AIM: To study the clinical significance of determining the serum concentration of phosphorus and calcium metabolism regulators--the morphogenetic proteins FGF-23 and Klotho in patients with different stages of chronic kidney disease (CKD). Phosphorus 82-92 fibroblast growth factor 23 Homo sapiens 155-161