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INTRODUCTION Recent approaches in tissue engineering using electrospun scaffolds showed the superiority of electrospinning in preparation of scaffolds.Yet some limitations appeared due to the tightly layer-by-layer process of electrospinning.For example,electrospun nanofiber scaffolds allow little cellular infiltration into their inside.This study fabricated a porous nanyarn scaffold,which allows cell infiltration and growth in the scaffold three dimensionally;this nanoyarn scaffold has been successfully used for tendon tissue engineering.