With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Apple was founded to develop and sell personal computers and has since become very profitable.
text_B: The GLIC receptor is a bacterial -LRB- Gloeobacter -RRB- Ligand-gated Ion Channel , homolog to the nicotinic acetylcholine receptors .. bacterial. bacterial. homolog. Sequence homology. nicotinic acetylcholine receptors. nicotinic acetylcholine receptors. It is a proton-gated -LRB- the channel opens when it binds a proton , ion -RRB- , cation-selective channel -LRB- it selectively lets the positive ions throgh -RRB- .. cation. cation. Like the nicotinic acetylcholine receptors is a functional pentameric oligomer -LRB- the channel normally works as an assembly of five subunits -RRB- .. nicotinic acetylcholine receptors. nicotinic acetylcholine receptors. pentameric oligomer. Pentameric protein. However while its eukaryotic homologues are hetero-oligomeric -LRB- assembled from different subunits -RRB- , all until now known bacteria known to express LICs encode a single monomeric unit , indicating the GLIC to be functionally homo-oligomeric -LRB- assembled from identical subunits -RRB- .. eukaryotic. eukaryotic. The similarity of amino-acid sequence to the eukaryotic LGICs is not localized to any single or particular tertiary domain , indicating the similar function of the GLIC to its eukaryotic equivalents .. eukaryotic. eukaryotic. tertiary. Protein tertiary structure. domain. Protein domain. Regardless , the purpose of regulating the threshold for action potential excitation in the nerve signal transmission of multicellular organisms can not translate to single-cell organisms , thereby not making the purpose of bacterial LGICs immediately obvious .. bacterial. bacterial
not_related.