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  1. Structure of the Heart From the National Institutes of Health (National Cancer Institute)  
    Anatomy/Images ... Anatomy ... National Cancer Institute ... From the National Institutes of Health
  2. Larynx & Trachea From the National Institutes of Health (National Cancer Institute)  
    Anatomy/Images ... Anatomy ... Tracheal Disorders/Start Here ... Tracheal Disorders ... Croup/Learn More ... Croup ... National Cancer Institute ... From the National Institutes of Health
  3. How the Eyes Work From the National Institutes of Health (National Eye Institute)  
    Eye Injuries/Reference Desk ... Eye Injuries ... Refractive Errors/Reference Desk ... Refractive Errors ... Anatomy/Images ... Anatomy ... Amblyopia/Reference Desk ... Amblyopia ... Eye Movement ...