Albiglutide is generated from a genetic fusion of two modified recombinant GLP-1 (736) molecules linked in tandem to recombinant human albumin (90), while dulaglutide is created by conjugating two GLP-1 (737) analogues to the Fc fragment of a modified monoclonal antibody (IgG4) via peptide ((Gly 4 Ser) 3 Ala) linker (91)
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References Iranmanesh A, Lizarralde G, Veldhuis JD
Its possible for blood donation to (temporarily) lead to falsely lowered HbA1c levels, likely because of a change in your blood volume and faster red blood cell turnover