It's a first step for scientists hoping to find a way to produce human organs for future transplants.

FOX's Gurnal Scott with the story:

The process uses pig embryos as vessels where human cells can grow and develop into organs, but scientists stress this is a very early stage of experimentation. The goal is to produce critical organs: hearts, livers and pancreases that can be created to match the needs of transplant patients.

However, the efforts aren't free from controversy as ethical questions are raised about pigs with the human organs being subjects of pharmaceutical testing to measure effects. Scientists hope this research leads to an era of specific and personalized medicine, but they add that practical applications are still "a long way off."

Gurnal Scott, FOX News.

Follow Gurnal Scott on Twitter: @GurnalScott