Sentence:  ( 4 ) The conjugates were passed through a diethylaminoethyl ( DEAE - ) <WSD>cellulose</WSD> column equilibrated with neutral phosphate buffer ( PBS ) containing * * f potassium phosphate and * * f . 
Meaning of the word marked with <WSD> tags:  a polysaccharide that is the chief constituent of all plant tissues and fibers