In 1983 gunther dennert of the usc school of medicine photographed some tumor cells before after they had been attacked by cytotoxic t lymphocytes, or killer t cells. his team found the plasma membrane of the target cells to be pocked with clusters of holes (not seen in the healthy cells) ranging in internal diameter from 5 to 20 nanometers. express this size range in mm. could proteins larger than 0.035um leak out through these holes? what is the largest diameter structures that could likely pass through these holes? um p. 6