Cryopreserved Diseased Bronchial Smooth Muscle cells stain positive for alpha smooth muscle actin and negative for von Willebrand factor VIII. All cells test negative for mycoplasma, bacteria, yeast, and fungi. HIV-1, hepatitis B and hepatitis C are not detected for all donors and/or cell lots. Product Link: http://www.creative-bioarray.com/Diseased-Bronchial-Smooth-Muscle-Asthma-CSC-C8071L-item-40381.htm