Study Detects Trigger for ‘Head-to-Tail’ Axis Development in Human Embryo
A human embryo in the lab at 9 days after fertilisation. The hypoblast (a group of cells outside the main embryo) sends a message to the embryo that initiates the development of the head-to-tail body axis. Using immunofluorescence analysis, the hypoblast is shown in green – these cells are asymmetrically distributed. A cavity is...