In this task, you will be given a sentence. You need to reconize the name of the disorder or disease. Disease is a disorder of structure or function in a human, animal, or plant, especially one that produces specific symptoms or that affects a specific location and is not simply a direct result of physical injury. Although there might be several correct answers, you need to write one of them.
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Question:  Patients were selected because they were heterozygous or homozygous for C2 deficiency .

Answer: C2 deficiency


Question:  Molecular defects leading to human complement component C6 deficiency in an African - American family .

Answer: C6 deficiency


Question:  Susceptibility to ankylosing spondylitis in twins : the role of genes , HLA , and the environment .

Answer:
ankylosing spondylitis