. "ylbenzthiazoline sulfonic acid) (ABTS) were obtained from KPL Laboratories, Inc., Gaithersburg, Md.; microtiter plates (Immulon II???) were obtained from Dynatech, Alexandria, Va.; kanomycin was obtained from GIBCO Laboratories, Grand Island, N.Y.; fetal calf-serum and keyhole limpet hemocyanin and other proteins can be obtained from Calbiochem-Behring, San Diego, Calif.; cell growth media and sup" . . .