Sentence:  Specific staining by DEAE-cellulose <WSD>treated</WSD> * * f and * * f , although clearly distinguishable under the microscope from either nonspecific staining or autofluorescence of cells , was not satisfactorily photographed to show such differences in spite of many attempts with black and white and color photography . 
Meaning of the word marked with <WSD> tags:  subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition