An adult cell nucleus (upper right) is injected into a mouse egg that lacks genetic material. (discovermagazine.com)
This is considered to be a hormone that helps with the creation of the sperm cell nucleus. (hghinjections.us)
20 We are family: Scientists suspect that a large DNA - based virus took up residence inside a bacterial cell more than a billion years ago to create the first cell nucleus. (discovermagazine.com)