** *Dear pdb-l, We have now updated the RNA two-dimensional (2D) topology component on the PDBe pages, building on the original implementation introduced in 2022 <https://www.ebi.ac.uk/pdbe/news/rna-topology-viewer-added-pdbe-pages>. This updated component now features base pairing information, emphasising the presence of secondary structure elements like helical stems and single-stranded loops. This enhancement was developed and integrated into the PDBe RNA topology viewer by Holly McCann and Caeden Meade, collaborators from Georgia Tech. Base pairing information is generated using the open-source FR3D software <http://europepmc.org/article/MED/21515634>and incorporated into the PDBe's weekly release process with assistance from partners at Bowling Green State University (BGSU) <https://www.bgsu.edu/>.* * The open-source RNA 2D topology component, available at https://github.com/PDBeurope/pdb-rna-viewer <https://github.com/PDBeurope/pdb-rna-viewer>, presents the secondary structure in consistent, reproducible, and easily recognisable layouts using R2DT <https://nature.com/articles/s41467-021-23555-5>. Base pairing annotations are superimposed on the R2DT-generated layouts, employing the Leontis-Westhof base-pairing classification <https://europepmc.org/article/MED/11345429>. Furthermore, the component interacts with the Mol* viewer allowing features in the 2D topology component to be easily explored in 3D. For more information about this update, visit https://www.ebi.ac.uk/pdbe/news/base-pairs-rna-secondary-structure-pdbe <https://www.ebi.ac.uk/pdbe/news/base-pairs-rna-secondary-structure-pdbe>. Kind Regards, David Armstrong * -- David Armstrong Outreach and Training Lead PDBe European Bioinformatics Institute (EMBL-EBI) European Molecular Biology Laboratory Wellcome Trust Genome Campus Hinxton Cambridge CB10 1SD UK