Scientists have produced a mouse that has 4% human cells.
It was born in Buffalo, which, in my estimation makes it a 4% American citizen with 4% human rights. It is said to have no human cells in its reproductive system, thus cannot make other mice that are chimeras.
If the researchers cannot respect the rights of the 4% human, they should release it. It has a 4% right to life, liberty, and the pursuit of happiness.