Registered users may create protein collections. These might be used to save the set of fluorescent proteins available in plasmids in a lab freezer, or a promising set of proteins that a user is currently considering for her application. Collections can be kept private, or shared publicly with a collection description and a permanent URL – in which case collections may be useful as “curated selections” (such as the list at www.fpvis.org). Collections have also been used to report spectra and attributes of FPs in the methods section of a publication. Collections can be created based on complicated search queries, by manually adding proteins from the respective protein pages, or by duplicating existing collections and modifying as desired. Lastly, the properties or spectra of all proteins in a collection can be easily downloaded in CSV or JSON format.