The materials, aptly named tissue papers, are made from structural proteins that are excreted by cells and give organs their forms and structures. The tissue papers are thin and flexible enough that they can be formed into origami birds.`
Researchers used ovarian, uterine, kidney, liver, muscle and heart proteins to create different types of tissue papers. The tissues were collected from processing pig and cow organs and each paper had different cellular properties of the organ it was made from.
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