has part realizes has_specified_input inheres in chromium-51 radioactivity detection in vitro cell killing assay molecular label role chromium release assay An in vitro cell killing assay in which radioactive chromium is absorbed by cells and released into supernatant when the cells die. The amount of radioactivity measured in the supernatant is a proxy for the number of cells that have died. Autologous EBV-transformed B-LCL were used as target cells for the influenza virus-specific CTL assays. Equal volumes of target and effector cells were added to triplicate wells of 96-well tissue culture plates, and 1:2 serial dilutions of effectors were made, producing effector-to-target (E:T) ratios of 100:1, 50:1, 25:1, and 12.5:1. After a 4-h incubation of the effector cells with the target cells, supernatants were collected following brief centrifugation and transferred to polystyrene tubes to be counted with the LKB 1272 Clinigamma counter (Wallac). Percent specific killing was determined with the following equation: (experimental 51Cr release - spontaneous 51Cr release)/(maximum 51Cr release - spontaneous 51Cr release) x 100. IEDB PlanAndPlannedProcess Branch chromium release assay metadata incomplete