4977
For the most part , slices of liver from fetal ( term ) , neonatal ( 4 - to 5 days old ) , and adult rats ( 70 days old ) were incubated with radioactive amino acids or various tritiated sugars specific for N - linked core oligosaccharide and / or N - linked terminal oligosaccharide chains .
 slices, liver, fetal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 slices, liver, fetal