The PSI standard, PSI-MI FeatureTab, is an exchange format for molecular interaction features. The PSI-MI FeatureTab format is part of the PSI-MI 2.5 standard. It is related to the tabular format provided by PSI MITAB 2.5 and subsequent updates. However, while the PSI MITAB 2.5 describes binary interactions, one pair of interactors per row, in the PSI-MI FeatureTab each row is feature centric and describes in detail a specific feature at the participant level and the effect of a feature, if any, on the second participant.
The specification, available here, and has been officially released on January 8th, 2026.