5554
Transient transfections of a construct expressing the RNA transcript defined by clone B1 . 1 into D17 cells led to the expression of an Env / Mlvi - 4 fusion protein with an apparent molecular mass of 33 kDa .
 Env, Mlvi - 4
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Env, Mlvi - 4