So histidine has a slightly more complex process in transforming it into glutamate. So let's see what this process is. So this is what histidine looks like. So we have this five membered ring. And by the activity of the enzyme histidine ammonia Lice, we essentially catalyze a simple elimination reaction in which this amino group acts as the Levin group. We have a pi bond that is formed between this carbon and this carbon, which basically acts to kick off this group here.