8140
In response to hypoxia, sickle red blood cells ( SS RBC ) and leukocytes exhibit increased adherence to the vascular endothelium, while diapedesis of leukocytes through the blood vessel increases .
 sickle red blood cells, leukocytes, SS RBC, leukocytes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 sickle red blood cells, leukocytes, SS RBC, leukocytes