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The pitch was built on a base called “the permavoid,” a substructure designed to support the field while allowing air and moisture to move under the root zone.

Moreover, this change in calcium levels occurred not only in the main body of the cell but also within substructures such as mitochondria -- the tiny power plants that cells use to produce energy.

There is a risk that the barges could come into contact with the “substructure” of the bridge, the McKees Rocks Police Department said in a statement early Saturday confirming the closure.

Gaia data revolutionized studies of the dynamics of stars in our home galaxy, and has already led to the discovery of previously unknown substructures.

The state must replace both the bridge’s superstructure and part or all of the substructure, he said.