AU RNA Bases

This image shows adenine & uracil nucleic acid bases, paired, left & right respectively. The pyrimidine adenine's double bonds are on the underside. The purine uracil's double bonds are shown topside.

The X-pegs are used with planar trigonal atoms to indicate double bonds and help illustrate the anti-parallel nature of a double helix. 

Note: the 2 ribose phosphates are not included but can be added to the shopping cart from the Related Products section below.