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The fuel efficiency of the American car and light truck fleet is at its lowest level in 20 years . The cortical region with the highest DHA concentration is the precentralis , which has long been known as the motor cortex . Gene expression is the process of producing the final , active product of a particular gene-it may be a protein or an RNA ( like rRNA or tRNA ) . But this particular Body and Soul week is not trying to offer the same experience as upmarket health spas and expensive Zen havens . Initial development of the water quality model is scheduled to be completed this fall .