Fluorescent images showing gene expression in human embryos at early and late stage of pre-implantation development, where blue is each cell of the embryo, green is a cell membrane marker, magenta is a placental gene expression.

Placenta is initiated first, as cells of a fertilised egg divide and specialise

23 September 2020

The first stages of placental development take place days before the embryo starts to form in human pregnancies. This new finding highlights the importance of healthy placental development in pregnancy, and could lead to future improvements in fertility treatments such as IVF, and a better understanding of placental-related diseases in pregnancy.

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