6936
The L2 , L3 , and L4 loops of the plexin - B1 RBD are involved in interactions with other plexin domains , GTPase binding , and RBD dimerization , respectively .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None