into their studies, and geneticists who focus on gene finding are now paying attention to the environment in an unprecedented way. However, now that the initial excitement surrounding gene-environment interaction has begun to wear off, a number of challenges involved in the study of gene-environment interaction are being recognized. These include difficulties with interpreting interaction effects (or the lack thereof), due to issues surrounding the measurement and scaling of the environment, and statistical concerns surrounding modeling gene-environment interactions and the nature of their effects.
