are hallmarks of cystic fibrosis. Chronic bacterial infections of the intestine  Buildup of mucus in the lungs and certain internal organs Sickling of red blood cells and pain in the extremities Malignant cells Defect connective tissues

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Tissue regeneration & repair

Tissue regeneration involves the restoration of tissue components by regrowth of damaged tissues. In contrast, tissue repair involves patching of injured tissue rather than restoring it. It is the proliferative capacity of the cells that decides the amount of regeneration against the repair that would occur in the tissue. Both regeneration and repair depending on the duration of the injury and response to the inflammation.