Sentence:  Speer and coworkers , in a similar study of blood group antibodies of whole sera , used a series of gradients for <WSD>elution</WSD> from DEAE-cellulose . 
Meaning of the word marked with <WSD> tags:  the process of extracting one material from another by washing with a solvent to remove adsorbed material from an adsorbent (as in washing of loaded ion-exchange resins to remove captured ions); used to obtain uranium ions