In all placental animals, placentas have evolved through the utilisation of existing tissues. It is a common misconception that two placentas means twins are dizygotic. Mammals without placentas either lay minuscule eggs (monotremes) or bear minuscule offspring (marsupials). According to the company's website, it extracts adult stem cells exclusively from postnatal placentas. Bandicoots are also the only metatherian marsupials that have placentas similar to eutherian mammals. Placentas were stripped of their membranous parts and fried with onions before being eaten. VUE is diagnosed in 7-10% placentas in pregnancies. Many species of mammals consume their placentas. Placentas with velamentous cord insertion have a lower vessel density. Other researchers report, that chimpanzees consume placentas after birth. Placentas are consumed in some human cultures. Now the egg became two placentas, each containing a set of twins, male and female. In pipefish placentas form following the interaction with the egg and the skin. The use of human placentas was terminated in favour of animal products. It is a rare disease, with an incidence of 1 in 1200 placentas.