Fig. 2From: pH-responsive and hyaluronic acid-functionalized metal–organic frameworks for therapy of osteoarthritisa–c Cytotoxicity of MOF, MOF@HA and MOF@HA@PCA in chondrocytes. d Cell viability was determined by live/dead assay of IL-1β-induced chondrocytes after treating with PCA or MOF@HA@PCA for 24 h (scale bar: 200 μm)Back to article page