pKa values of 10123104 Asp, Glu, His and Lys residues in 120770 soluble proteins.
pKa values of 1984563 Asp, Glu, His and Lys residues in 8711 transmembrane proteins.
pKa values of 2367154 Asp, Glu, His and Lys residues in 23337 protein-nucleic acid (PN), protein-protein (PP),and protein-ligand (PL_refined and PL_other) complexes.