Selectivity screen for Tat-C5 against a selection of 42 purified PDZ domains, performed with a fixed concentration of Tat-C5 (10 µM) in competition with PDZ domains and their respective fluorescent ligands. Data are normalized to binding in absence of peptide (full line). Dashed line represents the level of competition obtained for PICK1. Screen for C5 can be seen in EV1C. 