hey Kevin! it's been so long! I used to love your videos a lot but then I somehow forgot about your channel (my mistake, I probably didn't have my notifications on). nevertheless, thanks a lot for this video, I want to encourage you to keep up the great work you are doing. you have a gift to deliver crystal clear explanation of concepts which tend to be more complex as they may seem from the first look. also, could you just check my old comment on pyrvute dehydrogenase mechanism analysis? thanks a lot in advance, Rafael