24243
This paper describes the activities in the Neutral Red uptake ( NRU ) assay , the Salmonella mutagenicity test ( SAL ) , the mouse lymphoma mammalian cell mutation assay ( MLA ) and the in vitro micronucleus test ( IVMNT ) of Particulate Matter ( PM ) obtained from experimental cigarettes ( ECs ) , designed to produce reduced levels of toxicants .
 Neutral Red
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Neutral Red