7517
In this report , we study the self - assembly of two silk - elastin - like proteins : one is a diblock S ( 24 ) E ( 40 ) composed of 24 silk - like ( S ) repeats and 40 elastin - like ( E ) repeats ; the other is a triblock S ( 12 ) C ( 4 ) E ( 40 ) , in which the S and E blocks are separated by a random coil block ( C ( 4 ) ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None