Cloning dinosaurs

"Now we can make a baby dinosaur!" - Mr. DNA, Jurassic Park

The next step would be bringing the DNA strands to expression. For that, one would need to inject the dinosaur DNA into the |nucleus of a fertilized egg cell of a close relative of dinosaurs (birds or crocodiles, not frogs). This technique is based on reproductive cloning, which was used to clone Dolly. In the movie, [ostrich] and [emu] eggs are used for this purpose. However, the development of an embryo is regulated by hormones in the egg/uterus and the environment. These (bird or crocodilian) hormones need to have the same effect as their original dinosaurian counterparts. For that, they have to be able to recognize particular pieces of dinosaur DNA, a currently impossible task. New research in plastics, however, has allowed for the creation of synthetic eggs such as those that were used in the book. In the book, Henry Wu claims that egg yolk is nothing but a growth medium that can be created in a laboratory. However, if it were this simple, an embryo could just be put into such a medium and left to grow (a scene in Jurassic Park III seems to show that some embryos were placed in tanks and that the scientists achieved some success because the embryos did grow big enough to be visible. Extra hormones are needed from the original parent specimen, however, or constructed precisely from using the genome in order for the embryo to flourish.