Sentence:  Paper electrophoresis was carried out on the concentrated samples in a Spinco model R <WSD>cell</WSD> using barbital buffer , pH 8.6 , ionic strength 0.075 , at room temperature on Whatman 3 MM filter paper . 
Meaning of the word marked with <WSD> tags:  (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals