english: But what we now know, is that for a number of diseases, there are defects in the system, where the body can't prune back extra blood vessels, or can't grow enough new ones in the right place at the right time.
non_english: A pri številnih boleznih pride do napak v sistemu, ko telo ne more odstraniti dodatnih krvnih žil ali ustvariti dovolj novih ob pravem času na pravem mestu.