Experiments involving either no living materials or use of plants, bacteria, protozoa, or invertebrate animal species.
(Examples and Comments)
Biochemical, botanical, bacteriological, microbiological, or invertebrate animal studies, tissue cultures, studies on tissues obtained from autopsy or from slaughterhouse, studies on embryonated eggs. Invertebrate animals have nervous systems and respond to noxious stimuli, and therefore must also be treated humanely.