Scientists have developed a new Fab antibody therapeutic against Zika virus, which they believe may be more effective at crossing the placental barrier and provide protection to the fetus. Is this therapeutic likely to be effective?
a. Yes, this type of modified antibody would be able to cross the placenta
b. No, antibodies can't cross the placenta
c. No, Fabs lack the structures necessary for transport across the placenta
d. Yes, all is able to cross the placenta