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A highly specific accumulation of the toxic element lead was recently measured in the transition zone between non-calcified and calcified normal human articular cartilage. This transition zone, the so-called 'tidemark', is considered to be an active calcification front of great clinical importance. However, little is known about the mechanisms of accumulation and the chemical form of Pb in calcified cartilage and bone. Using spatially resolved X-ray absorption near-edge structure analysisdoi:10.1107/s0909049510052040 pmid:21335911 pmcid:PMC3042330 fatcat:bsywuyluvbgohgf44jyc77ujna