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Now, research published today in Current Biology suggests instead that the genetic fodder for the tiny dog breeds of today was actually lurking in the DNA of ancient wolves that lived more than 50,000 years ago, long before domestication began.

https://www.smithsonianmag.com/science-nature/mutation-that-gave-us-tiny-dogs-found-in-ancient-wolves-180979467/?utm_source=twitter.com&utm_medium=socialmedia