Sentence:  Treatment of the conjugates with ethyl acetate , and the conjugates ( which had been passed through Dowex-2-chloride ) with mouse liver <WSD>powder</WSD> , sweet clover crown gall tissue powder , or healthy sweet clover proteins did not satisfactorily remove nonspecifically staining substances in the conjugates . 
Meaning of the word marked with <WSD> tags:  a solid substance in the form of tiny loose particles; a solid that has been pulverized