PDZ domains are well characterised common structural domains. They are around 90 amino acids long and have a characteristic two α-helical/six β-strand structure. They are well known to be involved i protein-protein interactions. - [Liu, X. and Fuentes, E.J. (2019). Emerging Themes in PDZ Domain Signaling: Structure, Function, and Inhibition. _International Review of Cell and Molecular Biology_, [online] 343, pp.129–218. doi:https://doi.org/10.1016/bs.ircmb.2018.05.013.](https://www.sciencedirect.com/science/article/pii/S1937644818300637?via%3Dihub)