13-day-old human embryo grown in lab for controversial record-breaking study
All rights reserved. This pig embryo was injected with human cells early in its development and grew to be four weeks old. In a remarkable—if likely controversial—feat, scientists announced today that they have created the first successful human-animal hybrids. The project proves that human cells can be introduced into a non-human organism, survive, and even grow inside a host animal, in this case, pigs. This biomedical advance has long been a dream and a quandary for scientists hoping to address a critical shortage of donor organs.
Fetal development begins soon after conception. Find out how your baby grows and develops during the first trimester. You're pregnant. You'll undoubtedly spend the months ahead wondering how your baby is growing and developing. What does your baby look like?