In mammals, the zona pellucida is a glycoprotein matrix that surrounds oocytes and has an average thickness of 17 μm (). 1 It is vital for the production of oocytes in early development, 2 for ...

The zona pellucida protects the egg and the early embryo before implantation. Its structure seems simple—in humans it contains four kinds of glycoproteins, and in mice it only contains three.

The zona pellucida protects the egg and the early embryo before implantation. Its structure seems simple -- in humans it contains four kinds of glycoproteins, and in mice it only contains three.

Zona pellucida surrounding the oocyte plays an important role during various stages of oocyte development. During oogenesis, the zona pellucida facilitates a bi-directional communication between ...

The inner one is called the zona pellucida, a jelly cushion of protein. The outer layer is called the corona radiata — a sunlike array of helper cells that have been nurturing the egg inside the ...

Once a sperm reaches an egg's zona pellucida, it can partly dissolve the membrane with special enzymes. But the enzymes aren't enough for the sperm to completely break through and fuse with the egg.

Fertility:Key protein helps sperm do their job in timely fashion Date: August 20, 2021 Source: University of California - San Diego Summary: Researchers detail how a ubiquitous signaling molecule ...

Nearly 48 hours pass from the time sperm first bind to the outside of the zona pellucida, the human eggshell, until the first cell division of the fertilized egg.

The zona pellucida protects the egg and the early embryo before implantation. Its structure seems simple—in humans it contains four kinds of glycoproteins, and in mice it only contains three.