Figure 4From: Fabrication and properties of acellular porcine anulus fibrosus for tissue engineering in spine surgeryFresh and decellularized anulus fibrosus (AF) stained with sirius red. (A) Fresh AF stained with sirius red, Ă—40 magnification. (B) Decellularized AF stained with sirius red, Ă—40 magnification.Back to article page