18734
Several strains of infant gut - associated bifidobacteria possess lacto - N - biosidase , a membrane - anchored extracellular enzyme , that liberates LNB from the nonreducing end of human milk oligosaccharides and plays a key role in the metabolic pathway of these compounds .
 Chemical: N; Chemical: LNB
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: N; Chemical: LNB