Figure 4.

Fluorescence pictures of the printed CFX biosensors. The first three rows show the first sample set in the states wet (dried for one day after printing of the aptamer, then CFX was added), dry (drying for seven days after the measurement in the first row) and rehydrated (by adding water after the measurement in the second row). The last row shows the second sample set in the wet state (dried for eight days after printing of the aptamer, then CFX was added). Shown is the original picture as taken by the imager on the left and the background subtracted one on the right. The abscissa shows the ratio of aptamer to CFX. Each set was printed and evaluated three times, but only one is shown.