“…Therefore, the animal origin cardiac tissue, especially those derived from pigs that are free from α-Gal, can be an attractive source for tissue engineered animal origin prosthesis. Decellularization protocols may differ by the type of the elaborated tissue [ 23 , 24 , 25 , 26 , 27 , 28 ], the amount of the removed cells, or preservation level of extracellular matrix [ 29 ]. Unfortunately, using these protocols, it is impossible to remove all cells within the sample tissue.…”