injection of 5 milligrams of adenosine triphosphate per milliliter into adult drosophila melanogaster x ( e2 ) yb/sc ( 8 ) y ( + ) 4 to 8 hours old either immediately before or after administration of 2000 roentgens of x-rays protected those cells in spermatogenesis which were in or near meiosis from the loss of the ring x or the y ( + ) portion of y chromosome .
C0007634
cells
C0025186
meiosis