Lang, C. M., Vesell, E. S. 1976. Environmental and genetic factors affecting laboratory animals: impact on biomedical research. Federation Proceedings [Federation of American Societies for Experimental Biology. Federation Proceedings] 35, 1123-1124.

The survey suggests that many investigators do not fully recognize the influence of environmental and genetic variables on experimental results.... Failure to give an adequate description of these variables makes it difficult, if not impossible, to duplicate an experiment in other laboratories.