Sperm-Ovum InteractionsFertilization in VitroClone CellsEgg YolkOvumEgg ProteinsEgg ShellEgg WhiteCloning, MolecularParasite Egg CountMolecular Sequence DataBase SequenceAmino Acid SequenceEgg HypersensitivityOvipositionFertilizationDNA, ComplementaryDNASequence Analysis, DNARNA, MessengerZygoteNucleic Acid HybridizationSequence Homology, Nucleic AcidEgg Proteins, DietaryCell LinePolymerase Chain ReactionSequence Homology, Amino AcidGenesChickensSpermatozoaVitelline MembraneOocytesPhylogenyChromosome MappingBlotting, SouthernSchistosoma mansoniChromosomes, Artificial, BacterialGenomic LibraryPlasmidsBlotting, NorthernMutationSequence AlignmentDNA Restriction EnzymesNesting BehaviorTransfectionPhenotypeSpecies SpecificityDNA, BacterialEchinodermataDNA PrimersOogenesisTranscription, GeneticDNA, RecombinantGene ExpressionCosmidsUrochordataEscherichia coliXenopusLarvaReproductionXenopus laevis