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  1. Allergens, like pollen, are nothing more than foreign plant antigens. When they get released into the air, you can see and hear the result.When allergens ...
  2. Skip navigation National Library of Medicine Menu Health Topics Drugs & Supplements Genetics Medical Tests Videos & Tools About MedlinePlus Search Search MedlinePlus ...
  3. A change in the heart’s normal electrical conduction system can result in an arrhythmia, or irregular heartbeat. An arrhythmia can be an abnormally slow ...
  4. Health Videos: MedlinePlus Video (National Library of Medicine)  
    Skip navigation National Library of Medicine The navigation menu has been collapsed. Menu Health Topics Drugs & Supplements Genetics Medical Tests Videos & Tools ...
  5. A plaque is an abnormal cluster of protein fragments. Such clusters can be found between nerve cells in the brain of someone with Alzheimer. A microscope ...
  6. Bone X-Ray (Radiography) Video (American College of Radiology) (Radiological Society of North America)  
    Home Toggle navigation Tests and Treatments Pediatric Care Screening Diseases and Conditions Safety En Español Bone X-ray Bone x-ray uses a very small dose ...
  7. For the first 12 hours after conception, the fertilized egg remains a single cell. After 30 hours or so, it divides from one cell into two. Some 15 hours ...
  8. Sexual Problems Video (American Society for Reproductive Medicine)  
  9. Malignant tumors, as seen developing on the right vocal cord, are typically caused by tobacco use.
  10. Computed Tomography (CT) -- Head Video (Radiological Society of North America) (American College of Radiology)  
    Home Toggle navigation Tests and Treatments Pediatric Care Screening Diseases and Conditions Safety En Español Head CT Computed tomography (CT) of the head ...
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