Greetings.May I ask about something for my experiment? At first picture, three band(of each channel) have vivid blask. but surong experiment, channel 2(at middle) band disappeared by hal, and curve drew zig-zag when band disappers. but, the bands refreshed when washing by buffer(3X SSC). why it disappear during inject sample? can I reduce this phenomenon? Sample injected by peristic pump, and each channel is parellel.