Fig. 4From: Polyetheretherketone implants with hierarchical porous structure for boosted osseointegrationIn vitro cell adhesion and cytocompatibility. A SEM images of BMSCs on different substrates after culturing for 12 h. B The corresponding CLSM images. C Fluorescence images of calcein-AM/PI double stained BMSCs on diverse samples after culturing for 1 day. Calcein-positive cells: green; PI-positive cells: redBack to article page