6635
Gel mobility shift assays indicated that at least four nuclear proteins with distinct biochemical and binding properties possess the ability to bind the 3 beta I - A element to produce four DNA - protein complexes ( R1 to R4 ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None