Sea UrchinsStrongylocentrotus purpuratusGenomeGenome, BacterialGenome, ViralGenome, PlantGenome, HumanOvumGenome, MitochondrialGenome, FungalPhylogenyBase SequenceSequence Analysis, DNAGenome SizeLytechinusGenome, ArchaealEmbryo, NonmammalianEvolution, MolecularFertilizationParacentrotusGenome, InsectMolecular Sequence DataGenome, ProtozoanGenomicsAmino Acid SequenceSperm TailGenome, ChloroplastSequence AlignmentChromosome MappingSpermatozoaHemicentrotusSpecies Specificity