Strongylocentrotus purpuratusSea UrchinsStrongylocentrotusOvumEchinodermataFertilizationEmbryo, NonmammalianStrongyloideaBlastulaHyalinMolecular Sequence DataEctodermSperm TailSpermatozoaBase SequenceGene Expression Regulation, DevelopmentalGastrulaAmino Acid SequenceSperm-Ovum InteractionsPhylogenyGenesGenomeCloning, MolecularEgg ProteinsLarvaAcrosomeSequence Homology, Amino AcidGenes, RegulatorZygoteTubulinNucleic Acid HybridizationIn Situ HybridizationSequence AlignmentDNA, ComplementarySpecies SpecificityChromosomes, Artificial, BacterialRNA, MessengerDNAHistonesActinsEndodermEvolution, MolecularMultigene FamilySingle-Cell AnalysisSeawaterRegulatory Sequences, Nucleic AcidBlastocystTranscription, GeneticMolecular WeightMesodermTranscription FactorsSequence Analysis, DNASequence Homology, Nucleic AcidKelpRepetitive Sequences, Nucleic AcidTissue DistributionCalciumGene Expression RegulationProteinsWater Movements