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| | Sickle Cell Anemia |
 | | Symptoms and complications may also be experienced by people who have one sickle cell gene copy and one altered gene copy of another abnormal hemoglobin variant (doubly heterozygous), such as hemoglobin C or thalassemia. |
 | | It is unclear what actually causes sickle cell crisis, but it appears that some of the less sickled cells stick to the blood vessels and then the abnormally-shaped cells further block (vaso-occlusion) the small veins of the body. |
 | | Other complications of sickle cell disease may include gallstones, bone necrosis, kidney disease, increased risk of infection, leg ulcers, retinopathy (disease of the retina in the eye), and priapism (sustained erection). |
| www.labtestsonline.org /understanding/conditions/sickle.html (705 words) |
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