Let's assume that we have a match and that goose RNA in our sample bound to the goose DNA probes built on the array. We then rinse the array, so that any RNA that didn't pair is washed away. When researchers shine a laser on the array, the square containing goose DNA probes will light up, because the glow-in-the-dark tags attached to the goose RNA in the sample (UAGUAC) will fluoresce.