| http://www.w3.org/ns/prov#value | - Covers 503 and 506 may be comprised of any biocompatible flexible material, including, but not limited to, plastic or elastomeric polymers such as silicone, fluorinated polymers, ester- or vinyl-based polymers and polyolefin polymers, which preferably allow for the diffusion of gas from the environment into the chamber.
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