Sentence examples for existence is dubious from inspiring English sources

Other populations of putative stem cells have been described but their actual existence is dubious, mostly because the search for specific markers of hepatic progenitor cells has not yet been completely successful.

Honduras is dubious.

Mr. O'Reilly is dubious.

This claim is dubious.

Guessing is dubious.

Mr Seehofer is dubious.

Mr. Miller is dubious.

The claim is dubious.

Karlyne A. Mills is dubious.

Even that, however, is dubious.

But Hopkins is dubious.