Preferential release of a C-terminal arginine or lysine residue. Carboxypeptidase II is a dimer, where each monomer is composed of two chains linked by a disulfide bond. Expressed in the germinating embryo. Low levels in the developing aleurone and embryo. Also found in the roots and shoots of the growing seedling. The linker peptide is endoproteolytically excised during enzyme maturation. Belongs to the peptidase S10 family.