The human zona pellucida is composed of four glycoproteins (ZP1, ZP2, ZP3, and ZP4) and has an important role in reproduction. Here we describe a form of infertility with an autosomal recessive mod ...

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.

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 ...

Discover the crucial role of zinc sparks in mammalian fertilization, zona pellucida hardening, and embryo development.

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.

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.

Any burros gathered that were found to be fertile females, known as jennies, would be treated with the vaccine Procine Zona Pellucida before they would be returned to the site near the animal's ...

The second process is acrosome reaction (AR), a chemical action that involves releasing enzymes in the spermatozoa's head that further boost penetration of the zona pellucida.

Before it can fertilize an egg, a sperm has to bind to and bore through an outer egg layer known as the zona pellucida. Despite decades of research, some of the biological mechanisms behind this ...