Remember the most important biological databases:
\[
\boxed{
\begin{aligned}
\text{GenBank/EMBL/DDBJ} &\rightarrow \text{DNA Sequences} \\
\text{Swiss-Prot} &\rightarrow \text{Protein Sequences} \\
\textbf{PDB} &\rightarrow \textbf{3D Structures}
\end{aligned}
}
\]
PDB is the standard database for protein and nucleic acid structures.