Microvilli on WASP⁻ B lymphocytes are shorter and less pronounced in cell contacts.

Higher magnification of cell contacts from the electron microscopy studies in Figure 6. IL-4– and anti-CD40–stimulated WASP⁻ and WASP⁺ B cells are shown. (A) Note extensive microvilli contacts (white arrows) between WASP⁺B cells and the irregular cell shapes. (B) Microvilli network between WASP⁻ B cells was less extensive or absent, and cells had smooth surfaces (white arrows). Size bar represents 0.4 μm. Original magnification 8000 ×.