external matrix

ex·ter·nal ma·trix

the substance occupying the space between the inner and outer membrane of any organelle (for example, mitochondria) with a double membrane.
See also: intermembrane space.
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References in periodicals archive ?
The produced nanofibers enable the desirable interaction with cells by carrying out dimension and structural simulation of natural cellular external matrix.
In addition to up-shifting the construction function their strategy also required up-shifting and aligning marketing, sales, procurement, HR and matching levels in an external matrix with their clients and project partners.