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Thiocystine is produced in the hydrolysis of proteins.

Thiocystine is a relatively stable trisulfide analog of Cystine. Thiocystine functions as a persullide in transferring its sulfane sulfur to thiophilic acceptors[1][2].

[1] Abdolrasulnia, R., Wood, J.L. (1980). Biochemistry Of Thiocystine. In: Cavallini, D., Gaull, G.E., Zappia, V. (eds) Natural Sulfur Compounds. Springer, Boston, MA.
[2] Abdolrasulnia R, Wood J L. Persulfide properties of thiocystine and related trisulfides. Bioorganic Chemistry, 1980, 9(2): 253-260.