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The present disclosure relates to a polypeptide exhibiting granulocyte-colony stimulating factor activity. The polypeptide comprises at least one non-native cysteine residue at a site selected from the group consisting of T1CP2 (SEQ ID NO: 25), P2CL3 (SEQ ID NO: 26), L3CG4 (SEQ ID NO: 27), G4CP5 (SEQ ID NO: 28), P5CA6 (SEQ ID NO: 29), A6CS7 (SEQ ID NO: 30), S96CP97 (SEQ ID NO: 31), P97CE98 (SEQ ID NO: 32), L99CG100 (SEQ ID NO: 33), P101CT102 (SEQ ID NO: 34), E122CE123 (SEQ ID NO: 35), L124CG125 (SEQ ID NO: 36), M126CA127 (SEQ ID NO: 37), P138CA139 (SEQ ID NO: 39), A143CF144 (SEQ ID NO: 40), R146CR147 (SEQ ID NO: 41), R169CH170 (SEQ ID NO: 42), H170CL171 (SEQ ID NO: 43), L171CA172 (SEQ ID NO: 44), A172CQ173 (SEQ ID NO: 45), and Q173CP174 (SEQ ID NO: 46) in an amino acid sequence having at least 90% sequence identity to sequence set forth in SEQ …