ERK1 and ERK2 can be activated by growth factors, such as fibroblast growth factor 2 (FGF2), which causes endometriosis by regulating the ERK signaling pathway111; and vascular endothelial growth factor‐C (VEGF‐C), which promotes human mesenchymal stem cell migration via an ERK signaling pathway.112. The gene discussed is MAPK1; the disease is endometriosis.