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(a) Real-time optical images of each group of drug-impregnated nMBG@CPC composites injected in ddH2O within 1 min; all syringes can be pushed to the end and only a small amount of composite bone cement residue was found after injection; (b) optical image comparison of injected composite bone cements: FA and ALN impregnated nMBG@CPC maintained in ddH2O for 24 h.
