May be involved in the degradation of small peptides (2-5 residues) or in the degradation of storage proteins in the embryo. 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. Secreted into the endosperm. Simultaneously present in aleurone and endosperm between 20 and 30 days postanthesis. Accumulates in the developing grain and is stored in its active form in the mature grain. Also found in the roots and shoots of the growing seedling. Belongs to the peptidase S10 family.