Abstract
Lingula unguis seta gave an oriented X-ray diffraction photograph without any artificial treatments, and the seta was a composite texture of chitin and keratin. Chitin columns of 1 μm in diameter were embedded in keratin matrix. The crystal structure of the chitin was β-form, and also that of keratin. The molecular axes of keratin and chitin were parallel to the axis of the seta.
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Tanaka, K., Katsura, N., Saku, T. et al. Composite Texture of Chitin and Keratin in an Animal Organ, Lingula seta. Polym J 20, 119–123 (1988). https://doi.org/10.1295/polymj.20.119
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DOI: https://doi.org/10.1295/polymj.20.119