Containing or made from keratin.
- A punch biopsy of an alopecic patch on his scalp showed pigment casts with keratinous debris in the follicles, distortion of the hair shafts, and an increased number of catagen hairs.
- The wing spurs are keratinous structures that grow anteriorly from the carpal-metacarpal joints.
- In both skin and hair care products, the liberated carbon dioxide also functions to facilitate the delivery of active or functional substances to keratinous substrates, such as skin and hair.
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