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As dose increases, the SA reactivity decays as biotin is damaged by the incident electrons. Independently, amine reactivity appears at higher doses (∼150-500 μC/cm2). At both extremes, the patterned PEG microgels retain their ability to resist fibronectin adsorption. We confirm that the amine reactivity derives from the PEG main chain by demonstrating similar dose response in hydroxy-terminated PEG (PEG-OH), and we attribute this behavior to the formation of ketones, aldehydes, and/or carboxylic acids during and after electron-beam (e-bea