Subject: What is a lanthionine bond?

I teach Cosmetology. I am trying to understand what a lanthionine bond is. I am 
teaching the science of chemically straightening the hair.  The text we use 
says the bond results from introducing hydroxide ions (OH-) to the disulfide 
bonds of the hair structure. This process apparently removes one of the sulfur 
atoms from the hair. I want to know how this all works. I have searched the 
web, your site and consulted a physiology professor at our college to no avail.

Re: What is a lanthionine bond?