an evaluation of the chromatographic behavior of selected model proteins -- thioredoxin , ubiquitin , calmodulin , lysozyme , cytochrome c , and myoglobin on immobilized transition metal ions ( co2+ , ni2+ , cu2+ , and zn2+ ) -- allows establishment of the following facets of the histidyl side chain distribution : ( i ) either interior or surface ;
C0033684
proteins
C0039938
thioredoxin