Genes expressed higher in anagen than in the other groups were mainly associated with HF structure (HOXC13, KRT25, KRT31, KRT33A, KRT33B, KRT34, KRT35, KRT71, KRT83, KRT85, KRT86, KRTAP16-1, PMEL and TCHH). This evidence concerns the gene KRT33A and hydrops fetalis.