research Regulation of Keratin 9 in Nonpalmoplantar Keratinocytes by Palmoplantar Fibroblasts Through Epithelial–Mesenchymal Interactions
This study suggests that keratin 9 expression in nonpalmoplantar keratinocytes can be induced by signals from palmoplantar fibroblasts, potentially enabling the use of nonpalmoplantar epidermis to treat palmoplantar wounds.

