1746
Various mutant HN genes were constructed to examine the role of residues flanking the signal - anchor domain , including the cytoplasmic tail , on assembly and intracellular transport of the HN glycoprotein .
 mutant HN genes, HN glycoprotein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 mutant HN genes, HN glycoprotein