Hmm, very interesting. I don't have a clue, but I have noticed when you cut really early, or when something is wrong with the eggs and they haven't dimpled yet there is a lot of clear fluid. I'm not sure what happens to that stuff, if the baby absorbs it, or if it breaks down after 50 days, I don't know. It's the same with poultry eggs, the yolks grow into babies and the clear/white part of the egg disappears the further along incubation you are. I sometimes help my family by incubating poultry eggs at my house and there is little to no clear goo left by the end as long as nothing is wrong with the baby.