Seriously? You have no references for me? You suggest that I have no idea about human lung cell culture trial times, but it turns out you have no idea? I thought maybe you knew something about the topic and was going to defer to you when I decided to look it up. So which is it: You really do not have any clue what you are talking about with lung cell cultures? Then why pretend that you knew?
How about some actual answers/ references? I would hate to think you just make stuff up.