Ever since seeing “Fantastic Voyage,” the 1966 sci-fi film about a crew of biologists who were miniaturized to fit into a microbe-size submarine that sailed perilously through the human bloodstream — encountering dangers like parasites and immune-system defenses along the way — co-chair Steve Heller has fantasized that tiny homunculi actually control our bodies.

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“http://themoment.blogs.nytimes.com/2009/11/04/graphic-content-diagramming-fritz-kahn/”:http://themoment.blogs.nytimes.com/2009/11/04/graphic-content-diagramming-fritz-kahn/