“This type of ion can either be found coordinated by four Cys residues in rubredoxins or within a tetrapyrrole structure forming a heme group.”
At the bottom of page 19 and top of page 20. This would probably be more clear after having a lesson of group theory, but I can’t visually image what they mean by this.
I scrolled a bit through the paper and a lot of stuff I had already seen in previous courses up until g-strain. From that point on, there were more applications which previous courses didn’t cover, a reason why I’m taking this course.