Interior shots of medical laboratory with white coated men and women technicians at work. HAMCSs of fly feeding, of worm. CS PAN of medical books on shelves, chemical apparatus on table, flask bubbling. HAS of mouse doing a whirling dervish in shallow pan. CU of hands picking up an hour old baby mice. Lengthy shots of crazy mouse spinning at center of pan, of two mice in pan acting twice as madly. MS of scientist working at micromanipulator. Sequence showing two masked laboratory technicians transferring something from flask to test vials with a pipette. CU of white mouse on desktop. MS of desktop, of boy picking up white mouse. HAMS of hands putting two test tubes in centrifuge, of centrifuge whirling. CU and LACU of mouth of test tube as liquid is poured into dish. HAS of laboratory, two technicians at table in centre, X-ray apparatus with technician in background. PAN of raychrometer apparatus with a couple of technicians at work. CU of geiger tube.