Sentence:  A sample of Fraction * * f from group O <WSD>plasma</WSD> was dissolved in starting buffer , dialyzed against this buffer and subjected to chromatography using the gradient shown in Fig. 2 . 
Meaning of the word marked with <WSD> tags:  the colorless watery fluid of the blood and lymph that contains no cells, but in which the blood cells (erythrocytes, leukocytes, and thrombocytes) are suspended