Sentence:  For the albumin method , equal volumes of 30 % bovine albumin , sample and 2 % cells suspended in <WSD>saline</WSD> were allowed to stand at room temperature for 1 hr and then were centrifuged at 1000 rpm for 1 min . 
Meaning of the word marked with <WSD> tags:  an isotonic solution of sodium chloride and distilled water