With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ready Player One is a work.
text_B: In the field of molecular biology , the pregnane X receptor -LRB- PXR -RRB- , also known as the steroid and xenobiotic sensing nuclear receptor -LRB- SXR -RRB- or nuclear receptor subfamily 1 , group I , member 2 -LRB- NR1I2 -RRB- is a protein that in humans is encoded by the NR1I2 -LRB- nuclear Receptor subfamily 1 , group I , member 2 -RRB- gene .. molecular biology. molecular biology. protein. protein
not_related.