The microbivore, an artificial white cell, floats along in the bloodstream prior to encountering a pathogen. The nanorobot is about 3 microns in size. In this image, the binding site arrays appear as multicolored circular dapples on the blue sapphire-colored surface. The mouth of the nanorobot is open, and a few of the telescoping grapple arms are extended from the visible surface of the device.