A recent news story describing how scientists in China generated the first human-monkey chimeric embryos (unborn monkeys with human body parts)—a deliberate and unnatural crossing of species—sent shock waves through the world.

But this unethical experimentation on human embryos is not exclusive to China.

In addition, researchers injected embryonic stem cells from a destroyed human embryo into the mouse embryos to make human-mouse “chimeras”—a hybrid species with both mouse and human parts, including hybrid brains.

He is quoted in Technology Review saying, “I would advocate growing it [a human embryo] until day 40 and then disposing of it.”.

Moreover, exploiting human beings for experimentation is unnecessary, as numerous ethical research avenues exist—avenues which do not involve the creation and vivisection of young humans.

This limit—written into law in some countries, but only a guideline in others, including the U.S.—is insufficient to prevent the unethical creation of human embryos for experimentation.

There have been increasing calls to remove the 14-day limit as scientists seek to experiment on nascent human life.

The human embryos are called “blastoids” because they resemble the early blastocyst stage of a developing human being.

Human embryos were made from cultured human cells and cell lines—a new type of human cloning.

If the ISSCR drops the 14-day rule, the horrendous practice of growing human babies in the lab will almost certainly proceed unchecked.

A zero-day limit is the best rule for upholding the sanctity of every human life.