1.   Identigene put her in touch with a laboratory in New York, which sent someone to her home to gather a few cheek cells.

2.   In one science-class scene, Max gets a hall pass to escape having to examine his own cheek cells under a microscope.

3.   Just as microscopic mites live on our cheek cells and eyelashes, so our genomes may carry a plethora of nucleic squatters.

4.   Most labs test blood samples, but some use cheek cells, a less invasive method that they say is just as accurate.