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Free protein sulfhydryls were measured in liver protein homogenates by labeling with maleimide linked to a near infrared fluorescent dye followed by SDS - polyacrylamide gel electrophoresis .
 Chemical: sulfhydryls; Chemical: maleimide; Chemical: SDS; 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: sulfhydryls; Chemical: maleimide; Chemical: SDS; Chemical: polyacrylamide