go ahead,. mixing and matching, the one thing that came out with one of the studies, today that was published in the mid archive, is it showed possibly that if you got the j&j vaccine, the amount of virus neutralizing in a body with the second dose of j&j was lower, compared to either the 2 am and our vaccines, and you re seeing a lot of press saying that it s not as good as getting an eminent are a s a boost. i had pushback on that a little bit, because the way it, it was a small study number one, and secondly, the way these virus vector vaccines, work like the j&j vaccine, the amount of antibody tends to go up over time. and they stop that study it looked like after 29 days. where is in the early studies, you could show that it started to really go up after 30 40 50 even 70 days. so i think we have to correct