today it's due to be inspected by professor stefan montrose and his team. at 1st glance, it looks just like any other regular mass. but then you notice that 4 of its toes are missing. it was also, we want to find out what causes this kind of developmental defect most. the mouse is a useful object of study because of how closely we can track its development, of course. but ultimately we're investigating a human disease and the human phenotype, as we call it. and it's about patients so exhibit similar developmental defects in leisure. and the researchers use genetic engineering to create the defect altering mass genes, so their offspring are born with abnormalities. the mice now have the same genetic defect as professors patients at the shower to university hospital and they have, we can see how similar the changes are monday to side, completely different, which is a typical because the physical expression varies widely. you can see several thing is missing here. the other 2 are missing. on the other side, they're only partially developed and they're also par