Involved in the final stage of developmental programmed cell death and in intercalation of new cells. Cleaves extensins, thus probably supporting the final cell collapse. Expressed in roots, stems, flowers, buds, green siliques, trichomes and near the stomata of cotyledons but not of true leaves. Found at the hypocotyl-root transition zone, in the vascular tissue, along primary and lateral roots, but not in root tips. Never found in the abscission zone of flower organs. Expressed during silique development, but limited to the carpels and the pedicel. Belongs to the peptidase C1 family.