US scientists have unveiled the first litter of puppies born through in-vitro fertilisation (IVF). The seven puppies include five beagles and two beagle-cocker spaniel mixes. Their birth in July was announced on Wednesday by researchers at Cornell University in New York State and the Smithsonian Institution in Washington DC. 
Dr Alexander Travis of Cornell University explains the importance of this breakthrough.
Footage provided by Cornell University.

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