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Spectrofluorimetric determination of Se in 148 samples of 44 plant species revealed that the majority of the plants contained Se at a level from several to several tens of mu g / kg dry weight ( d . w . ) .
 Chemical: Se; Chemical: Se
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Se; Chemical: Se