RESOURCES

• Avera Twin Registry
• California Twin Program
  
• Colorado Twin Registry
  
• Michigan State University Twin Registry (MSUTR)
  
• Mid-Atlantic Twin Registry
  
• Minnesota Twin Registry
  
• NAS-NRC Twin Registry
  
• Pittsburgh Registry of Infant Multiples
  
• Southern Illinois Twins
  
• Stanford Twin Registry
  
• University of Washington Twin Registry
  
• NASA Twin Study​