During initiation of the psoriasis‐like disease (day 5), 20% of mutantGFP epidermal cells derived from mutantGFP K15+ bulge HF‐SCs were quantified by FACS analysis (CD45−CD49f+CD34− epidermal total population), whereas mutantGFP epidermal cells derived from mutantGFP K5+ basal keratinocytes/HF‐SCs was increased by 35–50% (Fig 3I). This evidence concerns the gene KRT15 and psoriasis.