SNX9 and infection: Adherent wild type and SNX9-/- cells appear phenotypically similar prior to infection, and both populations exhibited protrusions, filopodia and lamellipodia; however, SNX9-/- cells exhibited a small yet significant reduction in the numbers of filopodia per cell in non-infected cells (Fig 9A, compare WT and SNX9-/- in ‘NI’ cells).