title: Mother's milk and intrinsic immunity.
abstract: To limit the spread of retroviruses, mammals appear to have tailored a way to inhibit host-to-host infection by milk-borne retroviruses. In this issue of Cell Host & Microbe, Okeoma et al. (2010) reveal that the host restriction factor APOBEC3 expressed in mammary endothelial cells inactivates retroviruses released in maternal milk.
authors.affiliation: Emerging Pathogens Research Centre, University of Ottawa, ON K1H 8M5, Canada. langlois@uottawa.ca
authors.forename: Marc-André
authors.initials: MA
authors.lastname: Langlois