Scanning electron micrographs of cilia and cell surfaces. (A) Control cell; yellow dotted hexagon and arrows emphasize cortical units with a cilium arising from the center. (B) BBS7- depleted cell. (C) BBS9-depleted cell. Red dotted hexagons and red arrows indicate cortical units with short cilia arising, or no cilia. Note these cells contain cortical units with average length cilia arising (yellow dotted hexagons and yellow arrows). These are representative images, scale bars represent 2 μm.