893
Analysis of 4HNE protein adducts by immunogold electron microscopy showed appearance of 4HNE protein adducts in mitochondria as early as 3 hours , with a peak at 6 hours and subsequent decline at 24 hours .
 Chemical: 4HNE; Chemical: 4HNE
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: 4HNE; Chemical: 4HNE