Word: osteoblast
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Dates: during 1930-1939
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...into Youth. The rule that what is young must irrevocably grow old is almost universal in Nature. But not quite. The bones of animals generate a young cell called an osteoblast, which becomes a middle-aged cell called an osteoclast, which becomes an aged cell called a fibroblast, which ultimately dies. Dr. Franklin C. McLean and his University of Chicago co-worker fed parathyroid extract to aged fibroblasts, turned them into baby osteoblasts...
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