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Immunohistochemistry: (A) damaged cells with disintegrated nucleus presented in the longitudinal section of MWCNT-reinforced conduits (shown by arrow head); (B) most of the cells in control group were undamaged showing regular morphology (shown by asterisks); (C) no visible matrix deposition was present in MWCNT-reinforced conduits; (D) substantial amount of extra cellular matrix was deposited along the peripheral part of the wall of the control group (shown by dashed boxes).
