How insulin is synthesised in human (or mammals) . Give a suitable diagram?

Synthesis of insulin in humans-:
i. Insulin is synthesised as an inactive form pro-insulin which contains an extra stretch called the C peptide. 
ii.This pro-insulin is cleaved.
iii. C-peptide is removed and
iv. The two chains A and B  are joined by disulfide bridges  to form mature insulin.

  Fig.-  Proinsulin which contain C-peptide is cleaved and C-peptide is removed and the Two chains A and B are joined to by disulfide bridges to form insulin.