) Gross view of cell-laden alginate beads; (d) SEM image of the interior microstructure of alginate beads laden with P1 rACs in
chondrogenic medium for 28 d; (e) schematic illustration of suspension culture of cell-laden alginate beads in a spinner flask; (f) gross view
of a spinner flask; (g) cell-laden alginate beads in a spinner flask.