July 2009 in “International Journal of Cosmetic Science” Japanese women's curved hair has an uneven internal structure and varied amino acid composition.
76 citations
,
December 2011 in “Journal of Cell Science” Different keratin types have unique amino acid patterns that are evolutionarily conserved.
80 citations
,
December 1996 in “Pain” Disruption of glycinergic circuits increases pain sensitivity, suggesting new pain treatment options.
28 citations
,
September 2002 in “The Journal of Comparative Neurology” Presynaptic inhibition of certain nerve fibers in cats is mainly controlled by GABA and glycine.
August 2025 in “Frontiers in Nutrition” Leucine levels may affect hair loss after bariatric surgery.
February 2025 in “International Journal of Cosmetic Science” A new amino acid derivative, ATS, improves hair texture and moisture, making it easier to straighten curly hair.
38 citations
,
May 2000 in “Livestock production science” Giving high-quality protein or methionine supplements helps improve hair growth in Angora goats and, to a lesser extent, in Cashmere goats.
238 citations
,
May 1989 in “Journal of Investigative Dermatology” 
12 citations
,
August 1984 in “Genetics Research” The N gene affects the protein makeup of mouse hair.
11 citations
,
November 1966 in “Experimental Biology and Medicine” Hair diameter can indicate protein status in malnourished children if sample location is controlled.