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Sphingomyelin ( SM ) is a vital component of mammalian membranes , providing mechanical stability and a structural framework for plasma membrane organization .
 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