Protein Net charge Number of Identical Disulfide Molecular Weight at pH 7subunits subunits bonds 50,000 50,000 (25,000 for each subunit) 25,000 2 Yes No 0 Yes 4 100,000 (50,000 No Yes, between subunits Yes between all subunits for each subunit) 5 100,000 (25,000 4 No for each subunit)