<prompt> Disulphide bond is seen between-Lysine and cysteineCysteine and cystineCysteine and cysteineArginine and histidine  <response>: But the question ask disulphide bond is seen between or in other words which two amino acids react to form disulphide bond. Two molecules of Cysteine join together to form Cystine, which has a disulfide bond see fig. Cysteine cannot form disulfide bond with cystine. So disulphide bond is formed between two Cysteine molecules and not between Cysteine and Cystine 