The first few days of a human embryo’s development, known as pre-implantation, are important. It’s when the first cells are formed, and these decide if the embryo can survive, how it will implant in ...

During early embryonic development in mammals, the totipotency of the zygote — which is reprogrammed from the differentiated gametes — transitions to pluripotency by the blastocyst stage, coincident ...

The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific mystery. The process of how a humble single cell becomes an organism fascinates scientists across ...