the researchers at keio university managed to cultivate human cells into fallicular cells by adding certain proteins. they cultivated the cells with skin cells from a newborn mouse. then they transplanted the cells into another mouse. they succeeded in nurturing follicular cells in two to three weeks. >> translator: we have demonstrated the future possibility of producing hair through the use of these cells. >> reporter: but they caution that the team still had a number of hurdles to overcome. >>> heart surgery is taken for granted these days, but the procedure still carries risks. and those risks are multiplied when the patient is a child. one doctor decided to take on this problem and he started the way many investors do by making a model. >> reporter: heart surgery is a common procedure at this osaka hospital. this doctor is a cardiovascular pediatrician. he says operating on children presents special problems. the small size of the heart is one. genetic deformities can further complicate surgery. >> translator: the big difference is the size of the heart. this is a baby's heart. this is