Has antibacterial activity against the Gram-positive bacterium S.aureus and the Gram-negative bacteria E.coli and P.syringae. Does not have antibacterial activity against the phytopathogenic bacteria R.solanacearum, Rhataybacter sp and Erwinia sp. Does not inhibit trypsin, chymotrypsin or alpha-amylases. Monomer. Present in seeds, cotyledons and leaves. Not found in roots or stems. Present in seeds and seedlings, levels decrease with seedling age. Light increases the rate of degradation. Present until 9 days in seedlings kept in the dark, not found after 6 days in seedlings kept in the light. Belongs to the DEFL family. Protease inhibitor I18 (RTI/MTI-2) subfamily. Was initially thought to be a thionin.