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Long-term collagen sandwich cultures of fresh (grey), cryopreserved (blue) and bulk droplet vitrified (green) hepatocytes. a. Representative microscopy images of fresh, cryopreserved and bulk droplet vitrified hepatocytes. b. Metabolic reduction activity of Presto Blue in collagen sandwich culture. Scale bars: 400μm. Stars: p<0.05 Error bars: SD.
