I recently attempted to use P. aeruginosa (PA14) for some immunity experiments, but I ran into a weird problem. When I seeded my NGM plates with the PA14, the agar turned green. Is this normal or did my PA14 get mutated? Also, if I need to get a hold of a new batch of PA14, does anyone know where I can purchase this from? Any information you might share with me would be most appreciated.