Other genes are related to the progression of alopecia areata after the IP collapse of hair follicles such as the suppressor of cytokine signaling-1 (SOCS1) gene [43], FAS and FAS ligand genes [71], the neurogenic locus homolog 4 (NOTCH4) [72] and some chemokines encoding genes [73]. Here, FAS is linked to alopecia areata.