research Intrinsic curvature in wool fibres is determined by the relative length of orthocortical and paracortical cells 27 citations , March 2018 in “Journal of Experimental Biology” Wool fibre curvature is due to longer orthocortical cells compared to paracortical cells.
research Stiffness of Human Hair Correlates with the Fractions of Cortical Cell Types 4 citations , April 2019 in “Cosmetics” Hair stiffness is higher when it has more para-like cortical cells.
research Curl secret in cells March 2018 in “Journal of Experimental Biology” Hair curliness is caused by the arrangement and length of two different cell types.
research Characterization of curved hair of Japanese women with reference to internal structures and amino acid composition. 13 citations , October 2008 in “PubMed” Japanese women's curved hair has an uneven internal structure and varying amino acid composition.
research Keratin Gene Expression in Wool Fibre Development 5 citations , January 1988 Only two of the four keratin genes are expressed in wool fibers.