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. 2021 Dec 1;12(12):7906–7916. doi: 10.1364/BOE.445041

Fig. 2.

Fig. 2.

The microscopic images of unstained and Gram-stained bacteria. (a) and (d) are B. megaterium, while (b) and (e) are B. cereus. (c) and (f) are the mixtures of B. megaterium and B. cereus. (d)–(f) are taken by the color CCD camera.