| 41. | After binding to the corona radiata the sperm reaches the zona pellucida, which is an extra-cellular matrix of glycoproteins.
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| 42. | A special complementary molecule on the surface of the sperm head binds to a ZP3 glycoprotein in the zona pellucida.
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| 43. | This illustrated that not only could sperm immunocontraception be effective, but it could have several advantages over zona pellucida vaccines.
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| 44. | Such porcine zona pellucida ( PZP ) vaccines were tested in captive and domestic horses in 1986 with encouraging results.
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| 45. | ZP3, one of the proteins that make up the zona pellucida, then binds to a partner molecule on the sperm.
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| 46. | SUZI is an IVF technique where sperm is placed between the zona pellucida and the cell membrane of an oocyte.
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| 47. | Normally, molecules on the surface of sperm fit into complementary molecular sites on the membrane, which is called the zona pellucida.
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| 48. | The first of two projects involves immunizing female elephants with a vaccine made of proteins from the zona pellucida of pigs.
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| 49. | In this case, the vaccine is made from a protein found on the coating of a pig's ovum, called porcine zona pellucida.
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| 50. | Porcine zona pellucida alters the protein membrane around the female's egg so that sperm cannot penetrate the membrane and fertilize the egg.
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