10085
Therefore water and EtOH - water extracts ( 6 : 4 , v / v ) from 12 plants were tested on human primary dermal fibroblasts ( pNHDF ) and human HaCaT keratinocyte cell line by quantification of cell viability ( MTT assay ) and cellular proliferation ( BrdU incorporation ELISA ) .
 EtOH, MTT
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 EtOH, MTT