1963
To analyze systematically the distribution of Gal beta 1 - 4Gal in nature , we generated mouse monoclonal antibodies ( mAbs ) specific for Gal beta 1 - 4Gal using extracts of medaka eggs as an immunogen .
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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:
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