1969
Immunohistochemical staining of medaka sections revealed that Gal beta 1 - 4Gal epitopes were expressed in the endothelium , epithelium and epidermis , which directly contact the external environment or invading organisms .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None