The<unk> (eu-FEDS) is a hypothetical model describing a method by which immune<unk> s are capable of recognizing additional states of relatedness like "own species" such as is observed in maternal immune tolerance in pregnancy. The model includes descriptions of the proposed signaling mechanism and several proposed examples of exploitation of this signaling in disease states.
Eutherian fetoembryonic defense system 
Adaptation to extrauterine life
Primordial germ cell migration
Placental microbiome
Products of conception
Epigenetics in stem-cell differentiation
Sexual reproduction
Fetal resorption