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While older methods such as two - dimensional polyacrylamide electrophoresis continued to be used , a variety of more in - depth MS - based approaches including both label ( ICAT , iTRAQ , TMT , SILAC , SILAM ) , label - free ( label - free , MRM , SWATH ) and absolute quantification methods , are rapidly being applied to neurobiological investigations of normal and diseased brain tissue as well as of cerebrospinal fluid ( CSF ) .
 Chemical: polyacrylamide
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: polyacrylamide