Sentence:  Microscopically , both kidneys showed many small cortical scars in which there was glomerular and interstitial fibrosis , tubular atrophy , and an infiltration of lymphocytes and plasma <WSD>cells</WSD> . 
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