The expression of CD68 for macrophages on different materials at 96 h.
(a) Cells were immunostained by the primary anti-CD68 antibody and conjugated with FITC-immunoglobulin secondary antibody (green color fluorescence). Cell nuclei were staiend by DAPI (blue color fluorescence). Scale bar = 50 µm. (b) CD68 expression was quantified based on fluorescence intensity. **p<0.01: smaller than control (TCPS).