On the Cover: Matrilin-3 plays a role in modulating chondrocyte differentiation during embryonic development, in controlling bone mineral density in adulthood, and in preventing osteoarthritis during aging. Shown is the immunohistochemical staining pattern of the related proteins matrilin-1 (red) and matrilin-2 (green) in the tibial epiphyseal growth plate of a normal mouse at embryonic day E17.5. Nuclei were stained with Hoechst dye (blue). (See page 515)
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