Function
May play a role in the last steps of the chondrocyte differentiation pathway as an inducer of maturation (PubMed:13679380). Induces chondrocyte calcification during endochondral ossification by playing a role in the transcriptional inhibition of ENPP1, a generator of pyrophosphate which inhibits calcification (PubMed:16680148). Possibly impairs the binding of a transcription factor to the ENPP1 promoter (PubMed:16680148). Unlike other cystatins, does not have thiol protease inhibitor activity (PubMed:16680148).