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FTIR spectra in the fingerprint region (1800–950 cm–1) from commercial PHB (purple, top) as well as of O-PTIR spectra acquired from individual intact cells from PHB-positive (red line, B. sphaericus B0769) and PHB-negative (green line, B. sphaericus B7134) microbial populations. Plots are offset for clarity, and the main vibrational features are shown.
