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The PEG Mw used will be denoted numerically in kilodaltons as a subscript with x = 45 yielding 2 kDa PEG and x = 113 yielding 5 kDa PEG (e.g., 7a2 and 7a5 signify an alkyl-AM with a 2 kDa and 5 kDa PEG tail, respectively).
