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Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System. One of the easiest ways that companies can avoid animal exams are to use items that are already extensively found in human history and also have proven their safety over time. Companies could also depend upon data from natural and synthetic ingredients which are already previously tested on animals. Computer modeling and databases may be used to determine biological properties of ingredients and make risk assessments.