The linguistic root of tzaraath may mean smiting, in comparison with Arabic, in reference to a Talmudical explanation that it serves as a punishment for sin; it is quite possible that tzaraath was a general term for certain types of skin disease, rather than a particular condition, and the Talmud maintains a similar view, arguing that tzaraath referred generally to any disease that produces sores and eruptions on the skin.
Investigations of keratins extracted from wool by reduction hydrolysis and by alkaline hydrolysis showed that their chemical compositions and secondary structures were similar to original wool. The keratin isolates were similar in amino acid, Amides I and II, and secondary structure to each other and to original wool.
The raw material. Keratin is the essential component of hair. It is a protein formed by the combination of 18 amino acids, among which cysteine deserves special mention, being rich in sulphur and playing an important role in the cohesion of the hair.It is produced by the keratinocytes.hile hair contains water, lipids, traces of mineral elements and melanin, it is keratin which is its main constituent. Its organisation within the cortex is so reminiscent of a rope or a cable that it is almost worrying.