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December 2011 in “Annals of anatomy” Involucrin helps strengthen the inner parts of human hair.
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October 1985 in “The Journal of Cell Biology” Keratins and filaggrin change as fetal skin develops, marking key stages of skin formation.
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August 2007 in “Annals of Anatomy - Anatomischer Anzeiger” Feathers become harder as they develop due to a change in keratin type.