24806
We describe common strategies for mass spectrometric analysis of stable isotope labeled samples , as well as two widely applied phosphopeptide enrichment methods based on IMAC ( NTA - Fe ( 3 + ) ) and metal oxide ( ZrO2 ) .
 Chemical: NTA - Fe ( 3 + ); Chemical: metal oxide; Chemical: ZrO2
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: NTA - Fe ( 3 + ); Chemical: metal oxide; Chemical: ZrO2