1200
These three groups were further examined with regard to the modulation of discharge rate i ) during motor activity in W , ii ) at the transitional phase from SS to paradoxical sleep ( PS ) , iii ) during rapid eye movements ( REMs ) in PS , and iv ) following electrical stimulation of the midbrain reticular formation ( MRF ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None