It is a rare type with 21 known members as of 2009.

But a Focused person is a still a human being, not too different from certain rare types that have always existed.

There are about 3,500 types of native and exotic plants, many rare.

The profile said it was a very rare type, estimated one in a couple of million.

This has been a rare type of bridge, with fewer than two dozen built.

The plant is limited to a rare type of habitat and its populations are small.

A few days later, he was diagnosed with a rare type of lung cancer.

That is actually, though, a very rare type of cancer.

This rarer type of Down's syndrome can happen whatever the mother's age.

But the trial was also notable as a test case for a rare type of psychiatric defense.