binding

Depending on chemical markers placed on these histones, the chromatin can be wound tightly -- preventing transcription factors from binding -- or loosely, making it accessible for generating mRNA copies.

For decades, Berlin had tried to ensure peace with Moscow by binding the two countries together with trade and energy links.

The law, he has said, is unconstitutional and therefore not binding.

In order to get this clearance, Teixeira signed a "lifetime binding non-disclosure agreement" acknowledging that the "unauthorized disclosure of protected information could result in criminal charges", according to court documents.

The vote would not be legally binding but would be politically difficult for Labour MPs to ignore.