Fig 1: Concentrations of TNF-a, PDGF-b, IL-6 and IL-8 in cell culture supernatants as indicated. Data were obtained by averaging the values obtained during the intervals indicated on the x-axis. Error bars are standard errors of the mean. Note the different scales. Symbols indicate different culture conditions: • cells under control conditions,♢ cells on PCL scaffolds, and ♦ cells on PCL-collagen scaffolds