File:Adenine.svg, File:Uracil.svg, File:Phosphate Group.svg, File:Beta-D-Ribofuranose.svg. English phosphodiester bonds (phosphate groups circled in blue)
molecules including the nucleophilic water that breaks the scissile phosphodiesterbond at the recognition site. File:Saturn_System_Montage_-_GPN-2000-000439