Simultaneous Binding of Cu+ and Cu2+ at the Two-Tiered Copper Binding Site of the Intestinal Mucin MUC2 | Inorganic Chemistry pubs.acs.org/doi/10.1021/... @FranzLabDuke & co-workers @InorgChem #copper #cuprous #cupric #2_tiered #mucin #MUC2 #glycoproteins #simultaneous #pH #plasticity