4554
Preferential heterodimeric parallel coiled - coil formation by synthetic Max and c - Myc leucine zippers : a description of putative electrostatic interactions responsible for the specificity of heterodimerization .
 synthetic Max, c - Myc leucine zippers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 synthetic Max, c - Myc leucine zippers