Provided is a method for adaptive transmit power allocation in a multiuser OFDM system. The inventive methods and reagents may also be used to determine whether a compound, such as a chemotherapeutic agent, will have undesired toxicity toward normal tissues, which generally do not include a significant number of cells that are proliferating. In addition, a scan pulse is applied to the M electrode while applying the sustain pulse to the X or the Y electrode. The flap carries identifying indicia including a typically bar code indicia, so that the wall which defines the blood product chamber may be at least substantially free of opaque indicia. The microprocessor could adjust the color of the light emitted by the light source when a bather is detected.