With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Chris Stapleton is a songwriter.
text_B: Transferrins are iron-binding blood plasma glycoproteins that control the level of free iron -LRB- Fe -RRB- in biological fluids .. blood plasma. blood plasma. biological fluids. biological fluids. Human transferrin is encoded by the TF gene .. gene. gene. Transferrin glycoproteins bind iron tightly , but reversibly .. Although iron bound to transferrin is less than 0.1 % -LRB- 4 mg -RRB- of total body iron , it forms the most vital iron pool with the highest rate of turnover -LRB- 25 mg / 24 h -RRB- .. Transferrin has a molecular weight of around 80 KDa and contains two specific high-affinity Fe -LRB- III -RRB- binding sites .. KDa. atomic mass unit. The affinity of transferrin for Fe -LRB- III -RRB- is extremely high -LRB- association constant is 1020 M − 1 at pH 7.4 -RRB- but decreases progressively with decreasing pH below neutrality .. association constant. association constant. When not bound to iron , transferrin is known as `` apotransferrin '' -LRB- see also apoprotein -RRB- .. apoprotein. Apoenzyme#Cofactors
not_related.