Conceptual model of strain-specific differences in gene expression and chromatin state in the lung in response to 1,3-butadiene (BD) exposure. (A) Gene expression and chromatin accessibility of detoxification pathways, as well as those related to energy metabolism and the DNA damage response, in the lung of unexposed CAST/EiJ relative to the lung of unexposed C57BL/6J. (B) Changes in C57BL/6J detoxification-related gene expression and regulation profiles after exposure to 1,3-butadiene result in a molecular state that resembles that of CAST/EiJ. miRNA, microRNA.