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. 2021 Jan 12;11:603. doi: 10.1038/s41598-020-79727-8

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© The Author(s) 2021

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CpepSfGFP diagram. Diagram of the structure of the proinsulin with the super folder GFP (sfGFP) tag attached to it. Processing the proinsulin separates the normal insulin (left) from the CPeptide with the sfGFP tag attached to it (right).