Multimeric composition of vWF, analyzed by electrophoresis under nonreducing conditions on a 2.5% sodium dodecyl sulfate-agarose gel. At 48 hours samples were taken from the cellular (C), abluminal (A), and luminal (L) compartment of quiescent cells (lanes 2 through 4), 20 Gy single-dose irradiated cells (lanes 5 through 7), and PMA-stimulated cells (lanes 8 through 10). Lanes 1 and 11, normal plasma; lanes 10 and 11 were derived from the same experiment, run on a separate gel.