Fig. 3

“No-probe” negative for a 15-min exposure to 0.2 M HCl. a DAPI; b Texas Red; c Cy-5 (d composite of a–c.) Note the “positive” signal in this “No-probe” control for Fig. 3b–d. Marker bars in µm indicates magnification of × 40. (See Additional file 1 for the With-Probe control for this Figure.) The incubation with HCl is recommended to correct for false positive due to endogenous alkaline phosphatase in the tissue being studied