SEM images of human platelets attached to the different surfaces after 2 h incubation, with: A) Ti alloy CTL, B) alloy-HTE, C) CP-CTL, D) CP-HTE, E) Sprayed-CTL, F) Sprayed-HTE, G) Collagen I coated control, H) TCPS control and I) HA-Ti. Scale bar = 2 μm.