Figure 4.
Streptococcal Morphology after E-liquid or stock flavor treatments. Light microscopy images were taken at 1000× magnification after treatment with 100 µL of PBS, flavorless E-liquid, or the five stock flavoring agents. The green arrow indicates menthol crystalline formation and the orange arrow points at the presence of a hydrophobic material associated with cinnamon. Black bars on top four images = 10 µm. Images are representative of four different fields of view.