Sentence:  The DEAE-cellulose , containing 0.78 mEq of N / <WSD>g</WSD> , was prepared in our laboratory by the method of Peterson and Sober ( 7 ) from powdered cellulose , 100 - 230 mesh . 
Meaning of the word marked with <WSD> tags:  a metric unit of weight equal to one thousandth of a kilogram