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. Detected in ER bodies and another type of ER-derived vesicles. Expressed in roots, stems, rosette and cauline leaves, flowers, buds and green siliques. Found in the tip of young primary leaves, in very young root tips and at later stages in all tissues of lateral root, including the vascular bundle. Not expressed in lateral root primordia, while directly emerging through the epidermis. Belongs to the peptidase C1 family.