NCR1 and infection: This contention is corroborated by our results (see Figure S1) showing that, using the same infectious dose and infection time, VV-infected human fetal lung fibroblasts and particularly human foreskin fibroblasts expressed much lower levels of HA than HeLa cells, corresponding to lesser enhancements of the stainings by NKp30-Fc and NKp46-Fc.