With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Twenty One Pilots's drummer is American Josh Dun.
text_B: H / ACA ribonucleoprotein complex subunit 4 is a protein that in humans is encoded by the DKC1 gene .. protein. protein. gene. gene. H / ACA. snoRNA
not_related.