14550
The present study was investigated to evaluate the uptake and accumulation of selenium ( Se ) by the stem cuttings of Portulaca oleracea L . grown in alfisol amended with various concentrations of Se .
 selenium, Se
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 selenium, Se