7471
BACKGROUND : Mitosis is regulated by MPF ( maturation promoting factor ) , the active form of Cdc2 / 28 - cyclin B complexes .
 MPF, maturation promoting factor, Cdc2 / 28, cyclin B
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 MPF, maturation promoting factor, Cdc2 / 28, cyclin B