However, it is still unknown where exactly transcription starts and which regularly recurring DNA segments, DNA modifications or structural modifications of the DNA are required to determine the start of transcription. (sciencedaily.com)
In other words, changing the regulation of dopamine or some other compound appears to have the additional effect of causing structural modifications that also affect how neurons interact. (kavlifoundation.org)
Beginning with 2009 models, frontal airbag, seat belt, and additional structural modifications were made to further improve occupant protection in frontal crashes. (iihs.org)