Figure 1From: The association between ANKH promoter polymorphism and chondrocalcinosis is independent of age and osteoarthritis: results of a case–control studyExtracellular pyrophosphate metabolism. ANKH, (progressive) ankylosis human; Mg++, magnesium; NTP, nucleotide tri-phosphate; PC1, plasma cell glycoprotein 1; Pi, phosphate; PPi, pyrophosphate; TNAP, tissue non-specific alkaline phosphatase.Back to article page