20749
Here , we report that a specific 29 - amino acid peptide derived from the intracellular domain fragment of p75 ( NTR ) interacts with and potentiates binding of NGF to TrkA - expressing cells , leading to increased neurite outgrowth in sympathetic neurons as a result of enhanced Erk1 / 2 and Akt signaling .
 Chemical: amino acid
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: amino acid 
Answer:
 Chemical: amino acid