Sentence:  For the albumin method , equal volumes of 30 % bovine albumin , sample and 2 % cells suspended in saline were allowed to stand at room temperature for 1 hr and then were <WSD>centrifuged</WSD> at 1000 rpm for 1 min . 
Meaning of the word marked with <WSD> tags:  rotate at very high speed in order to separate the liquids from the solids