Which unexpected observation from studying bacterial immune systems led to the discovery of CRISPR, now marketed as revolutionary gene-editing technology?

Brand storytelling is crucial even in scientific industries. The discovery and development of revolutionary technologies often have fascinating narratives behind them that shape public perception and adoption. This poll tests your knowledge about how the CRISPR gene-editing technology story unfolded - a perfect example of scientific brand storytelling that transformed a complex molecular tool into a household name and revolutionized biotech.

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Repeating DNA sequences with strange spacing patterns in bacterial genomes
Unusual protein formations in bacteria exposed to viral infections
Spontaneous genetic mutations occurring in laboratory bacteria
Bacterial colonies surviving unexplained temperature fluctuations