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July 2019 in “PloS one” Patients with Alopecia areata have fewer specific immune cells that normally regulate the immune system, which may contribute to the condition.
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July 2023 in “International Journal of Dermatology” Lichen planopilaris patients are more likely to have hypothyroidism.
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April 2018 in “Scientific Reports” Psoriasis patients' immune response to a hair protein depends on their specific gene type.
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August 1999 in “European journal of endocrinology” The study concluded that testing hormone levels after stimulation is not reliable for identifying carriers of 21-hydroxylase deficiency; genetic testing is necessary.
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June 1976 in “JAMA” Most women with ankylosing spondylitis tested positive for HLA-B27, suggesting it's useful for diagnosis.