| 41. | 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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| 42. | Once this occurs, the sperm is capable of binding with the zona pellucida, and the acrosome reaction can occur.
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| 43. | In order for an egg to be fertilised, sperm must first bind to, and then penetrate the zona pellucida.
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| 44. | The zona pellucida, which remains with the oocyte after ovulation, contains enzymes that catalyze with sperm to allow penetration.
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| 45. | This illustrated that not only could sperm immunocontraception be effective, but it could have several advantages over zona pellucida vaccines.
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| 46. | ZP3, one of the proteins that make up the zona pellucida, then binds to a partner molecule on the sperm.
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| 47. | After binding to the corona radiata the sperm reaches the zona pellucida, which is an extra-cellular matrix of glycoproteins.
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| 48. | It can be also carnivorous in captivity, and has been documented as devouring the snail " Vitrina pellucida ".
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| 49. | The protein, ovoperoxidase, most likely acts as a catalyst that cross-links tyrosine residues found within the zona pellucida.
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| 50. | 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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