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We hypothesized that plasma from women with EPE increases blood - brain barrier ( BBB ) permeability vs . plasma from women with late - onset preeclampsia ( LPE ) or normal pregnancy ( NP ) and investigated its underlying mechanism by perfusing cerebral veins from nonpregnant rats ( n = 6 - 7 / group ) with human plasma from women with EPE , LPE , or NP and measuring permeability .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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