<prompt> Which of the following statements best applies to the following diagram?Depicts the cell-membrane MHC product associated with narcolepsyEssential for the transplacental passage of antibodyFound on T and B lymphocytes and all nucleated cellsPresent on macrophages but not neutrophils  <response>: The figure shown in the question is a schematic representation of the MHC class I molecule, which has a CD8 binding site a3 and a peptide-binding site a1 and a2 . MHC class I is active on all nucleated cells. 