english: But the solution is animal tissue because it's plentiful, it's cheap, you can get it from young, healthy tissues, but the barrier is immunology.
non_english: Ve çözüm de hayvan dokusu, bol miktarda ve ucuz. Bunu genç, sağlıklı dokulardan alabilirsiniz ama buradaki sıkıntı bağışıklık.