Proteins C is a "glycoprotein", meaning that one or more sugars have been covalently attached to its side chains via post-translational modification. Describe how Concanavalin A Sepaharose could be used to isolate Protein C from the mixture. Specify how any elution steps might be carried out. Be sure to cite the reference you used to determine how "ConA Sepharose" works.
Protein A - pI of 7.4, molar mass of 82,000
Protein B - 3.8, 21500
Protein C - 7.8, 23000
Protein D - 7.8, 22000