Figure 1: The scheme of the study on intra-articular injection with a material according to experimental groups and microscopic appearance. (a) The study scheme for intra-articular injection of a material according to an experimental group. (b) A light-microscopy image of ASCs having spindle-shaped morphology. (c) A light-microscopy image of alginate microbeads in the absence of cells. (d) Light-microscopic appearance of microencapsulated ASCs at the time of implantation, with 300–400 cells within each 400–500 μm capsule. Scale .