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To support these human procedures are pressure barriers, radio-controlled alarms, and Petri dishes with protection levels increasing as you move towards the inner sanctum - the aseptic environment. All of this is checked against 'manufacturing good practice' guidelines and is constantly assessed internally and externally.

Out of these precautions and procedures I was attracted to the concept of these often-invisible barriers over which 'dirty' things should not pass. There are obviously some physical barriers to interrupt the circulation of germs, but in other places it was a line that should not be crossed (without being sprayed with alcohol at least!).

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