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The myofibroblasts make up a high proportion of the fibroblasts proliferating in the postembryonic wound at the onset of healing. In the rat model, for instance, myofibroblasts can constitute up to 70% of the fibroblasts,[1] and is responsible for fibrosis on tissue.[citation needed] Generally, the myofibroblasts disappear from the wound within 30 days,[4] but can remain in pathological cases in hypertrophy, such as keloids.[2][4] Myofibroblasts have plasticity and in mice can be transformed into fat cells, instead of scar tissue, via the regeneration of hair follicles.[5][6]