hMSC microencapsulation. (a) Macroscopic image of BaCaps. (b) Microscopic image of BaCaps (original magnification, ×10). (c) Viability staining (original magnification, ×10) of encapsulated hMSCs was performed with calcein (green, live cells) and propidium iodide (red, dead cells). Bars = 100 μm. (d) The time to clot formation shows no significant difference among porcine whole blood, empty BaCaps, and BaCaps that contained hMSCs.