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Biofilms formed on saliva-coated glass cover slips. Sixteen hour biofilms of S. gordonii DL1 or ΔfruRBA grown in TY-G or TY-F media (top panels), and in YPT-G or YPT-F media (bottom panels). Two representative views of transmitted light microscopy fields of crystal violet -stained biofilms formed in each medium are shown for each strain.
