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Understanding the hepatotoxicity of drugs is essential for progress in academic and industrial research. Studying hepatotoxicity in vitro is challenging because hepatocytes, the metabolically active cells of the liver, are very difficult to maintain in culture. It has been observed that culturing hepatocytes between two layers of collagen maintains in vivo-like morphology and also many drug metabolizing enzymes for weeks. In spite of the research examining drug metabolism in collagen sandwiches, there is limited data regarding the applicability of this system to hepatotoxicity studies. We...