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To achieve this goal, cyclic peptides containing cysteine residues are rationally designed and synthesized. Among the peptides tested, those containing two cysteine residues exhibit superior stabilizing properties, ensuring the solubility and long\u2010term stability of the QDs in aqueous solutions for several months. The newly synthesized QDs exhibit unique excitation\u2010dependent multicolor photoluminescence with a quantum yield of 20.55% and 45.50% for CdS and CdSe, respectively, providing versatility for imaging applications. Cellular uptake studies using HCT 116 cells reveal effective internalization of the QDs into both the cytoplasm and nucleus, highlighting their potential applications in bioimaging and drug delivery. 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