Confidence votes 11. According to Wikipedia, the width of the Atlantic Ocean at its narrowest point is 2,848 kilometers (1,770 mi) between Brazil and Sierra Leone.
Paroxysmal nocturnal hemoglobinuria or PNH is a rare and chronic disease that results in an abnormal breakdown of red blood cells. PNH is due to a spontaneous genetic mutation that causes red blood cells to be deficient in a protein, leaving them fragile.
Here are the steps that lead to PNH: 1  The abnormal stem cell makes copies of or clones itself. This leads to a whole population of stem cells that have mutant PIG-A. 2  The abnormal stem cells turn into mature red blood cells that have mutant PIG-A. These are called PNH red blood cells.