until now

The molecular mechanisms that control this process were hardly known until now.

But the US has never allowed Kyiv to use the long-range missiles inside Russia – until now.

"I wanted to pursue research in mathematics, as I've had a lifelong interest in the subject, but never had the opportunity to take part in math-based research until now," Hartman said.

However, until now, it wasn't clear whether stress played a role in memory generalization.

But until now, it was unclear whether Kennedy would have an official position in the new administration.