I don’t know what they want from this topic.
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12. A-B-0 blood groups. The Rh blood types
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15. Generators and conductors of impulses in the heart. Refractory periods
13. The role of leukocytes in the defence mechanism
Previous page:
12. A-B-0 blood groups. The Rh blood types
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15. Generators and conductors of impulses in the heart. Refractory periods