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(a) Scanning electron microscope (SEM) image of a carbon nanotube porous block (CNTp). Scale bar, 100 μm. (b) SEM image of CNTp. Scale bar, 10 μm. (c) When a scaffold composed of interconnected porous hydroxyapatite ceramics (IP-CHAs) was immersed in a bovine serum albumin (BSA) solution, more protein was adsorbed to CNTp and the protein concentration in the solution was reduced. Image is modified from a study by Tanaka et al. [51].
