GCNT3 and infection: Surprisingly, mice doubly-deficient in C2GnT1 and C2GnT2 (C2GnT1/2−/− mice) and mice deficient in all 3 C2GnT family members (C2GnT1/2/3−/− mice) were unable to expel their worms by day 21 post-infection (Figure 4A).