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Besides, the cuticle-L + U lane showed a lighter blue band than that of the raw wool and cuticle-FA, indicating the cuticle-L + U was more difficult to be dissolved than cuticle-FA. Keywords: Wool fibers; cuticle isolation; keratin; l-cysteine; secondary structure; thermal stability; ; ; ; L- ; ; EN Wool fibers cuticle isolation keratin l-cysteine secondary structure thermal stability ZH L- 7714 7727 14 11/21/22 20221220 NES 221220 Introduction Wool has been widely used in the textile industry due to its excellent elasticity and heat retention property. FT-IR spectrum of the raw wool, cuticle-FA, and cuticle-L + U FTIR spectra comparison between the raw wool, cuticle-FA, and cuticle-L + U showed differences in 1200-1000 cm SP -1 sp . SDS-PAGE analysis of the raw wool (Lane 1), cuticle-FA (Lane 2), cuticle-L + U (Lane 3) Conclusion Taken together, our data demonstrated that pure and flaky-shaped cuticle cells could be effectively isolated with the L-cysteine and formic acid methods, respectively. [Extracted from the article]