A mixture of proteins (pepsinogen, myoglobin, and cytochrome c) is subjected to anion exchange chromatography at pH 5. In what order would the subsequent proteins be eluted from DEAE cellulose anion exchanger by a rising salt gradient: cytochrome c (pI, 10.6), pepsinogen (pI, 1.0) and myoglobin (pI, 6.8)?