I read an article about scientists trying to reverse engineer dinosaurs from modern birds, the article explained that a modern chicken's genome still has the code to produce features like teeth and a tail, that code simply wasn't active and scientist used to think it was just a bunch of junk code left over.    So basically they could activate the unused code in a bird and get a dinosaur, the amber extraction they said was like extracting DNA from fossilized bones, there's simply no DNA to extract.