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Effect of LIUS preconditioning on the chondrogenic differentiation and hypertrophic changes of rabbit MSCs in PGA scaffold in nude mice. (A) Safranin O/Fast green staining for the expression of proteoglycans in the implanted constructs at 1, 2, 4 and 6 weeks (x10). (B) von Kossa staining for the calcification of the implanted constructs (x10).
