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We describe the characterisation of a novel monoPEGylated recombinant human granulocyte colony-stimulating factor analogue, pegteograstim (Neulapeg), prepared by site-specific 20 kDa maleimide-PEG conjugation. An additional cysteine was inserted between Gly136 and Ala137 of filgrastim (methionyl human granulocyte colony-stimulating factor) for site-specific PEGylation, and Cys18 of filgrastim was...
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