title: Dr. Appel replies.
authors.affiliation: Rheumatology, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany. heiner.appel@charite.de.
authors.forename: Heiner
authors.initials: H
authors.lastname: Appel
mesh_terms: D000844:Ankylosis / Q000378:metabolism*; D005260:Female; D005528:Foot / Q000473:pathology*; D006801:Humans; D058574:Integrin-Binding Sialoprotein / Q000378:metabolism*; D008297:Male; D015675:Osteocalcin / Q000378:metabolism*; D053495:Osteopontin / Q000378:metabolism*; D044162:Parathyroid Hormone-Related Protein / Q000378:metabolism*; D025241:Spondylarthritis / Q000378:metabolism*
chemical_list: D058574:Integrin-Binding Sialoprotein; D044162:Parathyroid Hormone-Related Protein; D015675:Osteocalcin; D053495:Osteopontin