Mesenchymal stem cell-derived signaling and growth factors obtained by platelets influence hair growth through cellular proliferation to prolong the anagen phase (FGF-7), induce cell growth (ERK activation), stimulate HF development (β-catenin), and suppress apoptotic cues (Bcl-2 release and Akt activation) [63]. The gene discussed is FGF7; the disease is hydrops fetalis.