"We believe this is kind of a new structure not really known before", said a researcher.

The basic structure of nuclear weapons has been known, and published, since 1949.

The structure is known for its unique and elegant form.

These structures are not usually known for their architectural value.

He said once the molecular structure was known, the job should be easier.

These structure are known to be generated in two different ways during S phase.

The particular structure I was in was known to me.

Organic matter has not been characterized either and no unique structure is known.

The redesigned structure will certainly be smaller, but little else is known about it.

Indeed from one epoch to another the same structure many be known by different names.