18078
Treatment of the cells was effective in increasing their proliferation in a time - and concentration - dependent manner , especially in the presence of synthetic sphingomyelin in the medium .
 Chemical: sphingomyelin
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: sphingomyelin