3.4.23.20 - 30585, 30586, 30594, 30596, 668813 3.4.23.20 aqueous two-phase system system using 9% (w/v) PEG 8000, 5.2% (w/v) NaCl, and 15.9% (w/v) sodium citrate 753904 3.4.23.20 penicillopepsin-JT1 to homogeneity 668813 3.4.23.20 penicillopepsin-JT2 668813 3.4.23.20 recombinant enzyme 653829 3.4.23.20 using magnetite nanoparticles with azocasein immobilized 755308