Larger structures observed in mature biofilms with
transmitted light and through GFP fluorescence were
also colocalized with the signal from Congo red (CR)
and thioflavin T (ThT). These stains are routinely used
as characteristic tests for the presence of a wide variety
of amyloid proteins, including for diagnosis and study
of disease-causing plaques formed by amyloidosis [60–63],
and in many investigations of microbial adhesion and biofilm
formation