Animals measured in the Nuclei data set were either subjected to chronic restraint stress (stress) or not (control).
A factor vector indicating which stress group the individuals in Nuclei belong to.
The data are provided courtesy of David Crews at the University of Texas at Austin.
Crews, D, R Gillette, SV Scarpino, M Manikkam, MI Savenkova, MK Skinner. 2012. Epigenetic Transgenerational Alterations to Stress Response in Brain Gene Networks and Behavior. Proc. Natl. Acad. Sci. USA. 109 (23). 9143 - 9148.