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I am very sad at Christopher's death because he set such an extraordinary example over the last nine years, showing courage and tenacity in finding a new way of life.
His focus on stem cell research, on getting himself better as an example for other people, was very inspirational.
I think we have lost a very brave and courageous and dedicated individual.
Christopher and I saw a lot of each other on the Superman set, and we'd have lunch together and saw each other socially.

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