Eric Reiter of the Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) in France will engineer nanobody-based biologicals to block ovulation as a practical, non-hormonal contraceptive with fewer side effects. Blocking the molecular regulators of ovulation is an attractive contraceptive mechanism. However, it can also affect steroid hormone production, which causes undesirable side-effects. Nanobodies are antigen-binding domains of antibodies that can very selectively modulate signal transduction pathways.