Editor's note: Anna Guerrero created the above image for this article. You can find the full image and all relevant information here.

Editor's note: Madeleine Howell-Moroney created the above image for this article. You can find the full image and all relevant information here.

During the twentieth and twenty-first centuries, Robert Paul Lanza studied embryonic stem cells, tissues, and endangered species as chief scientific officer of Advanced Cell Technology, Incorporated in Worcester, Massachusetts. Lanza's team cloned the endangered species of gaur Bos gaurus.