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We found that naloxone - precipitated withdrawal , but not chronic morphine administration , caused a strong induction of phospho - histone H3 immunoreactivity in the nucleus accumbens ( NAc ) shell / core and in the lateral septum ( LS ) , a change that was accompanied by augmented H3 acetylation ( lys14 ) in neurons of the NAc shell .
 Chemical: naloxone; Chemical: morphine; Chemical: phospho; Chemical: lys14
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: naloxone; Chemical: morphine; Chemical: phospho; Chemical: lys14