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Dysregulation of hair regeneration in AA. A Clinical presentation of a patient with AA. B The pathobiology of AA involves immune cells attacking the lower part of the growing HF, which include expanded population of antigen-presenting macrophages, CD4+ T cells and CD8+ T cells around the HF. C GWAS results showing the potential genes involved in AA and their chromosomal locations. D List of current treatment options for AA and the possible mechanisms
