7668
The prominent lesions were confined to the cerebral surface layer and leptomeningeal tissue including the arachnoid vessels , which were all bathed in the cerebrospinal fluid , suggesting that some necrotizing toxins had been secreted into the fluid by the B . cereus .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None