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The effect of mild thermal stress on the appearance of sucrose density gradient profiles. Sucrose gradients of the four regions of a (a) 31-year-old lens pair and a (c) 75-year-old lens pair before (left) and after (right) incubation at 50°C for 15 hours. (b, d) Sphingomyelin content at each interface of the sucrose gradients from the core regions before and after incubation.
