From:  Synthetic peptides as valuable and versatile tools for research: our 20 year journey in Chile

Common labels used with peptides

LabelStructureUseReferences
RhodamineIt can be coupled as an amino acid in the synthesis process and used to track peptide location in microscopy.[67, 69, 76]
Fluorescein
BiotinCoupled as an amino acid in the synthesis process and used to track the peptides by joining them to labeled streptavidin protein in the target cell.

Compounds structures were drawn with ACD/Chemsketch 2021.2.1 [77]