Discussion In the technique of affinity chromatography, a ligand with high affinity for the receptor of interest is immobilized via a stable covalent linkage onto an insoluble support matrix, such as agarose. This ligand is usually attached via a linear hydrophilic spacer arm such that the ligand is free to float in the void of the resin where it is accessible to the receptor of interest. A solubilized receptor preparation is placed on the column and ...