24295
Brain - derived neurotrophic factor ( BDNF ) is an important regulator of synaptic transmission and long - term potentiation ( LTP ) in the hippocampus and in other brain regions , playing a role in the formation of certain forms of memory .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None