Complex sentence: Note that the two LXs have their 15-hydroxyl residues in the "S" chirality configuration because all of the ALOX enzymes form 15 "S"-hydroxy AA products.
Split into simpler sentences: Note that the two LX's have their 15-hydroxyl residues in the "S" chirality configuration. This is because all of the ALOX enzymes form 15 "S"-hydroxy AA products.