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To examine the cell and discover how to stop the disease and or control it
This question is like "When did you stop beating your wife".
A checkpoint is a place you MUST stop at. There is a vet at each checkpoint to examine the dogs. Also, there is a 24 hour stop that you may not leave until 24 hours later.
The forensics team will examine the crime scene.The doctor needs to examine you.He likes to examine nature.
We will carefully examine the evidence.He used a magnifying glass to examine the small writing.