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In contrast , pellets from the CLA - fed animals contained fewer infiltrating cells , which formed limited branching cellular networks , the majority of which had collapsed lumen and no RBCs .
 cells, cellular networks, lumen, RBCs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 cells, cellular networks, lumen, RBCs