5013
Rat - 1 cells which had been transformed with the activated Ha - ras - 1 gene from human EJ bladder carcinoma cells were fused with diploid embryonic rat fibroblasts .
 Rat - 1 cells, EJ bladder carcinoma cells, embryonic rat fibroblasts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Rat - 1 cells, EJ bladder carcinoma cells, embryonic rat fibroblasts