There have been many attempts to classify proteins into groups of related molecules in terms of their primary, secondary and tertiary structure. An overview of these classification schemes is ...

As the number of environmental small subunit (SSU) ribosomal RNA gene sequences has greatly surpassed the number of cultured microorganisms, reconciliation of the established taxonomy and ...

Select Agents (SAs) are listed dangerous bacteria, viruses, toxins, and fungi. However, natural variation and intentional genetic modification blur the boundaries of a Select Agent list based on names ...

With thousands of exoplanet candidates discovered, astronomers are starting to figure out how to group them in order to describe them and understand them better. Many planet classification schemes ...