Fig. 3From: Failure to detect M. avium subspecies paratuberculosis in Johne’s disease using a proprietary fluorescent in situ hybridization assay“No-probe” negative control for Additional file 7. This was a 35-min exposure to 0.2 M HCl. a DAPI, identifying the presence of DNA. Note the positive signal in this “No-probe” control for b–d. Marker bars, in µm, indicate magnification of x 40Back to article page