I am verifying the answers generated by an automatic system to the following question: when did zacharias janssen make a discovery related to the cell theory
Suggested answer: Zacharias Janssen (also Zacharias Jansen or Sacharias Jansen) (b.1580-88, d.pre-1632 to 1638) was a Dutch spectacle-maker from Middelburg associated with the invention of the first optical telescope .
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