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Scheme of implantation of the specimens and groups of animals. Each group included three rats to whom the specimens were implanted twice, e.g. on the left and the right side from the backbone of the same animal. The total number of repeats for composite materials was 6; for pure aliphatic polyester specimens, it was 12. NCC: nanocrystalline cellulose, PCL: poly(ε-caprolactone), PDLLA: poly (D,L-lactic acid), PGlu: poly(glutamic acid).
