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To create a fetus you need one egg and one sperm. This is why fraternal twins look slightly different from one another! What makes monozygotic twins similar? Proteins BioSystems BLAST Basic Local Alignment Search Tool BLAST Stand-alone BLAST Link BLink Conserved Domain Database CDD Conserved Domain Search Service CD Search E-Utilities ProSplign Protein Clusters Protein Database Reference Sequence RefSeq All Proteins Resources American Journal of Medical Genetics. Monoamniotic twins are always monozygotic.
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