FKN induces the secretion of the receptivity-related cytokines at anemia, which may improve endometrium receptivity via the CX3CR1 and the regulation of the NFκB pathway and by regulating activin, follistatin, and BMP2, as well as PR, SOX-17, PTGER2, and TIMP2. The gene discussed is NFKB1; the disease is anemia.