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The apparent molecular weights of the collagenolytic enzymes were determined by electrophoresis of cell extracts and concentrated conditioned medium in type IV collagen - embedded polyacrylamide gels followed by renaturation and activation of the enzymes within the gels .
 Anatomy: cell extracts
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: cell extracts