In 2007, scientists created human-sheep chimeras - sheep that have 15% human cells and 85% sheep cells. The modified sheep are, ultimately, to be re-purposed as organ donors.
This, in my opinion, is wrong on so many ethical and moral levels.
... and recently it’s been discovered that spotted salamanders have algae living symbiotically within their cells, which has sparked the interest of scientists who posit the possibility of a future version of our species that may be able to breathe underwater if they can figure out how to Frankenstein a photosynthetic Homo Sapiens.
However, despite my many misgivings about the advisability of messing with nature, there IS one genetically modified beast that I would welcome with open arms. THE TRANSPARENT CAT. Think of it ... no more issues when you want to read a newspaper or book, an end to irritating interruptions at the computer ... truly an idea whose time is overdue!