fig4

Figure 4. High Stability/Low Stability Patch Test Samples, derived from passage 4, on ATCC 6919. The above picture illustrates the capacity of the passaged lysogenic bacteria taken from the fourth pass of the patch test to produce an area of clearing surrounding the lysogen streak (high stability group, on the right). Also shown is a prior putative pseudolysogen that possessed the ability to cause lysis but lost its lysing capacity after the fourth passage (low stability group, on the left). Positive and negative controls were also prepared (lawn of pure ATCC 6919, and putative pseudolysogens with no bacterial lawn, respectively), and demonstrated successful bacterial growth (not shown).