FGF12 and psoriasis: To investigate whether FGF12 plays a positive or negative role in psoriasis, we crossed Fgf12 floxed mice (referred to as Krt14+/+‐Fgf12f/f mice hereafter) with Krt14‐Cre transgenic mice to selectively ablate of FGF12 in keratinocytes (referred to as Krt14Cre/+‐Fgf12f/f mice hereafter) and thereby determine the role of FGF12 in keratinocytes in psoriasis (Figure S2A,B, Supporting Information).