Less than 100 cases have been identified since its discovery.

This question has been asked since their discovery in 1930, and we are little closer to an answer today.

Since its discovery no other natural product of similar structure has been found.

Since her discovery, Moore has been in the media's attention.

Since his discovery, an entirely new field of cancer research has developed.

The name of the cave changed several times since its discovery.

The species has been never recorded again since its discovery.

Ten days since the discovery of Juliet's body, and nothing new, either good or bad.

Ever since his lunch break and the discovery that he was being followed, he'd been on edge.

It was weeks since their discovery and he hadn't even bothered to look at them.