The cryogenic electron microscope structure of the A4p-activated (green) CalpL protein filament (violet) from Candidatus Cloacimonas acidaminovorans (PDB ID: 9EYJ). CRISPR-Cas systems help to protect ...

In all living organisms, the biomolecule transfer RNA (tRNA) plays a fundamental role in protein production. tRNAs are generated from precursor molecules in several steps. The enzyme tRNA splicing ...