IL-1β, but not BMP-7 leads to a dramatic change in the gene expression pattern of human adult articular chondrocytes—Portraying the gene expression pattern in two donors - Saas, J.; Haag, J.; Rueger, D.; Chubinskaya, S.; Sohler, F.; Zimmer, R.; Bartnik, E.; Aigner, T. (Cytokine, 2006)