Engineered viruses that don’t replicate provide a tractable model for scientists to safely study SARS-CoV-2, including research into vaccine efficacy and emerging variants.

Almost 60 percent of people in a new study on attitudes in the US felt comfortable using animals to grow human organs from induced pluripotent stem cells.

A T cell discovery, “hachimoji” DNA, a new species of human, and mounting fears of espionage rounded off the list this year.

Scientists are devising human-animal hybrids for harvesting human organs, but lab-derived mini-organs are a less ethically fraught solution to meeting the need for transplantation.

The researchers aim to grow transplantable human organs from primate embryos.

Many researchers see the move to relax the rules as a welcome change, yet some are worried the revisions don’t take public concerns enough into consideration.

Studying how neural crest cells journey through the embryo, this Caltech developmental biologist has revealed how they form major cell types, including peripheral neurons, bone, and smooth muscle.

Determining which products of advanced biotechnology are deserving of legal protections is essential to our own social architecture.

While the hope is to one day grow organs for transplantation into people, several technical and ethical challenges remain.

Researchers produce functional organs composed of both mouse and rat cells.

Andrzej Tarkowski’s research laid the groundwork for future advances in cloning, stem cell research, and in vitro fertilization.

The public gets to weigh in before the US government lifts its ban on such research.

Can mice with humanlike tissues better model drug effects in people?

Ethical issues attend the creation of animal-human chimeras.

Artist Brian Andrews uses human and veterinary x-rays to create haunting animated hybrids.

Researchers have bred monkeys derived from six different monkey parents.

Careful oversight is required to ensure that chimeras and transgenic animals continue to serve as powerful biomedical research tools.

Chimeric mice harboring organs from rats suggest that engineered animals may one day grow human tissues for transplant.