With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tony Blair was elected team leader.
text_B: In enzymology , a phosphatidylserine decarboxylase is an enzyme that catalyzes the chemical reaction. enzymology. enzymology. enzyme. enzyme. catalyzes. catalysis. chemical reaction. chemical reaction. phosphatidyl-L-serine phosphatidylethanolamine + CO2. phosphatidyl-L-serine. phosphatidyl-L-serine. phosphatidylethanolamine. phosphatidylethanolamine. Hence , this enzyme has one substrate , phosphatidyl-L-serine , and two products , phosphatidylethanolamine and CO2 .. enzyme. enzyme. substrate. substrate ( biochemistry ). phosphatidyl-L-serine. phosphatidyl-L-serine. products. product ( chemistry ). phosphatidylethanolamine. phosphatidylethanolamine. This enzyme belongs to the family of lyases , specifically the carboxy-lyases , which cleave carbon-carbon bonds .. enzyme. enzyme. The systematic name of this enzyme class is phosphatidyl-L-serine carboxy-lyase -LRB- phosphatidylethanolamine-forming -RRB- .. enzyme. enzyme. phosphatidyl-L-serine. phosphatidyl-L-serine. phosphatidylethanolamine. phosphatidylethanolamine. lyase. lyase. systematic name. List of enzymes. Other names in common use include PS decarboxylase , and phosphatidyl-L-serine carboxy-lyase .. phosphatidyl-L-serine. phosphatidyl-L-serine. lyase. lyase. This enzyme participates in glycine , serine and threonine metabolism and glycerophospholipid metabolism .. enzyme. enzyme. glycerophospholipid metabolism. glycerophospholipid metabolism. It has 2 cofactors  : pyridoxal phosphate , and Pyruvate .. cofactors. cofactor ( biochemistry ). pyridoxal phosphate. pyridoxal phosphate. Pyruvate. Pyruvate
not_related.