Watson and Crick mentioned it slightly in their paper but didn't
propose a full method of replication. a number of different people
collaborated to work out the full model of replication which is
still no totaly finished, (few proteins left to find)
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Matthew Meselson and Franklin Stahl show how new DNA is made by
copying the old.
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The experiment that supported the hypothesis that DNA
replication was semiconservative was known as the Meselson-Stahl
Experiment.