ZMYND10 and infection: To determine if the ΔNA(RBD)-Flu virus induces an anti-RBD antibody response in vivo, we intranasally infected four groups of four mice with either a high dose (8 × 105 TCID50) or lower dose of ΔNA(RBD)-Flu (8 × 104 TCID50), a control virus expressing GFP in the NA segment (ΔNA(GFP)-Flu, at 8 × 104 TCID50), or performed a mock infection (Fig 3A).