Keratin is a fibrous structural protein that plays a crucial role in the formation of hair, nails, horns, and other similar structures in animals, including humans. It is composed of alpha-keratin and beta-keratin, which are responsible for the strength and resilience of these structures. Keratin is made up of amino acids, including cysteine, which forms disulfide bonds that contribute to its stability. This protein is essential for maintaining the integrity and health of our hair and nails, and it is also found in the outer layer of our skin, providing a protective barrier.
The CAS Registry Mumber 9008-18-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 8 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 9008-18: (6*9)+(5*0)+(4*0)+(3*8)+(2*1)+(1*8)=88 88 % 10 = 8 So 9008-18-8 is a valid CAS Registry Number.