In your particular case, the symbiont is only just settled into cell tissue.

The adult mite lives on sap, sucked from the cell tissues.

To be seen clearly under an optical microscope, cell tissues often have to be stained to increase contrast.

The Homeostatic process is essential for the survival of each cell, tissue, and body system.

He then injects the liquefied cell tissue under the patch into the defect.

New eyes could be grown from cell tissue to replace those deliberately blinded by the Schell-Peng in order to concentrate her mind on her talent.

Took cell tissues from James's body.

AfterTaylor destroyed it, I had my people collect scrapings of the alien cell tissues and preserve them for analysis.

Dr. Muhar has some cell tissue under the microscope.

Ultrastructure (or ultra-structure) is the detailed structure of a biological specimen, such as a cell, tissue, or organ, that can be observed by electron microscopy.