Sentence examples for challenging enigma from inspiring English sources

For instance, TGF β-1 exerts a "dual" role on cancer cells, and that paradoxical behavior is well recognized as a challenging enigma that, still now, classic molecular biology has not been able to elucidate [ 84– 84].

The concept of the African enigma has been challenged since it has been suggested that the enigma could be explained due to lack of infrastructure and access to hospitals and care in African countries resulting in incomplete reporting of gastric cancer.

Martinez has been both a challenge and an enigma for Pelini and his staff.

For Alex Adelman, that challenge proved an enigma.

This vision of the unconscious also describes a certain type of novelist one who deploys elision and enigma in his storytelling to provoke and challenge readers.

And then there is the decision to join the NASL itself: to some, it, like the Cosmos, is still an enigma that will continue to have questions over its long term goals – To challenge the MLS or not?

He passed up a high-profile British revival of "Barnum" to do a new musical, and was taken with the inventive language and the challenge of playing an enigma.

Unfortunately, the origin of the nucleolus remains a huge enigma and major challenge for evolutionary biology.

The origin of the key features of the eukaryotic cell that are conserved in their complete, highly complex form in (almost) all eukaryotes and so are confidently mapped to the last common ancestor of all extant eukaryotes is a major enigma and a challenge to evolutionary biology.

The game features collectible objects and puzzles similar to the Riddler challenges of previous games (orchestrated by Enigma before assuming his Riddler identity).

We review the current progress of the ENIGMA Consortium, along with challenges and unexpected discoveries made on the way.