This is the nucleotide dAMP, or deoxy-adenosine-5'-monophosphate. The phosphorus atom in the phosphate group is purple or pink, the sugar is a 5-membered ring with a red or orange oxygen atom in the ring, and the base, adenine, is a heterocyclic molecule, whose nitrogen atoms are blue.

There are four such nucleotides in DNA. The others are dCMP, dGMP, and dTMP.

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