Ignoring stress in lab animals could mar research / New Scientist, 2 June 2007
http://digbig.com/4tbrb
Ann Baldwin ; Marc Bekoff
Magazine issue 2606
"MEDICAL and biological research relies heavily on studies of lab animals such as mice and rats. These are often inbred strains, and are kept in "standard" cages so that different groups can be compared - animals missing a particular gene are compared with those that don't, for example, or animals given a drug with those that aren't."