OCA2 and infection: The reason for using PIV5ΔF.F157.mCherry vector was that although it was predicted to have an acute/lytic phenotype (because it has a phenylalanine at position 157 in the P protein) for reasons that remain unclear, the majority of cells infected with PIV5.F157.mCherry did not die by 3 days post-infection (p.i.), in contrast to cells infected with PIV5.F157.GFP, which expresses GFP rather than mCherry (Fig. 6).