a resonance was found at 7.95 ppm downfield that does not move with ph , is not seen in the oxidized protein , has the same pseudocontact shift in the co ( ii ) derivative as the c-2 proton of histidine-35 has in the co ( ii ) derivative of p. aeruginosa azurin , and , in the apoprotein , exhibits a typical protonation shift downfield at ph less than 5 .
C0033684
protein
C0003601
apoprotein