Protein interactions, cell membrane. Clip 6 of 7. Animation showing proteins interacting on a cell membrane, some embedded and some free_floating. Some membrane proteins receptors bind to and detect free_floating proteins. Others form rafts, such as the ones in the background here. These proteins found on white blood cells include ICAM tall, toll_like receptors curved, hook_like dimer, and CD4. The smaller membrane molecules foreground are sugars. This clip is part of a sequence showing cellular protein interactions. For the entire sequence, see clips K003/3837 to K003/3831.