17638
The neuroprotective effects of obovatol and honokiol were attributable to the inhibition of intracellular reactive oxygen species production , followed by protection of the mitochondrial membrane potential ( Delta Psi m ) , recovery of Bcl - 2 and Bid levels , inhibition of apoptosis - inducing factor expression , and phosphorylation of mitogen - activated protein kinases such as p38 kinases , extracellular signal - regulated kinases , and c - Jun N - terminal kinases .
 Chemical: obovatol; Chemical: honokiol; Chemical: oxygen; Chemical: N
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: obovatol; Chemical: honokiol; Chemical: oxygen; Chemical: N