The Protein Data Bank (PDB) is a repository for x-ray crystallographic, and nuclear magnetic resonance (NMR) data of large biological molecules and complexes. This resource can be used to find visual representations of a biological molecule of interest. Various 3D representations of the molecule of interest, including space filling, ball-and-stick, and ribbon models, can be viewed in the browser, or files containing coordinate data can be downloaded to use with compatible molecular viewing and manipulation software (ex. Chimera, mMaya). Other information about the molecule, including sequence length, posttranslational modification locations and common structural motifs, which hint at the functions of different parts of the molecule, can also be found here.