Darwin's theory of natural selection provides an explanation for why organisms develop traits that help them survive and reproduce. Because of this, death is often seen as a failure rather than a ...

Due to its rigid structure, proline frequently causes stalls at ribosomes—the "protein factories" of the cell. All organisms use a specific factor to overcome these stalls. In bacteria ...

A study published in PNAS reveals how a bacterial pathogen coordinates N ... genomic island in pathogenic Salmonella containing five proteins of unknown function and a small noncoding RNA.