29159
As shown in a cell culture model , polySia - NCAM - 140 was kept in the late trans - Golgi apparatus of lung epithelial cells and stimulation by IL - 1 beta or lipopolysaccharide induced metalloprotease - mediated ectodomain shedding , resulting in the secretion of soluble polySia - NCAM .
 polySia, polySia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 polySia, polySia