A protein may contain several cysteins, which my pair together to form disulfide bonds as shown in the figure. If there is an even number n of cysteins, n/2 disulfide bonds can form. How many different disulfide pairing arrangements are possible?
For clarity, see attached for the question with the figure.
So I think the number of arrangements, N, would be equal to:
Is this correct, and if not, could someone explain it to me? Thanks,