3632
Also , the grafts maintain a constant volume between 3 and 8 weeks , thereby indicating that primary skin fibroblasts do not produce tumors .
 grafts, skin fibroblasts, tumors
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 grafts, skin fibroblasts, tumors