Scanning electron micrograph of a 3T3 cell growing in culture. Complexity and diversity of structure across the cell surface is apparent in the this image that s courtesy of Susan Brown. Figure 48 from Chapter 2 (Specializations of the Free Surface) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.